Fair Value Disclosures [Abstract] Fair Value, Measurement Inputs, Disclosure [Text Block] Fair Value, Measurement Inputs, Disclosure [Text Block] Income Statement [Abstract] Sales Revenues Cost of sales Cost of Goods and Services Sold Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income Operating Income (Loss) Interest expense, net Interest Income (Expense), Net Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Weighted average number of shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Weighted average number of shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Basic earnings per share Earnings Per Share, Basic [Abstract] Basic earnings per share Earnings Per Share, Basic Diluted earnings per share Earnings Per Share, Diluted [Abstract] Diluted earnings per share Earnings Per Share, Diluted Cash dividends declared per common share Common Stock, Dividends, Per Share, Declared Segment Reporting [Abstract] Summary of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Revenue [Abstract] Revenue [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Industrial [Member] Industrial [Member] Industrial. Water Treatment [Member] Water Treatment [Member] Water treatment. Health and Nutrition [Member] Health and Nutrition [Member] Health and Nutrition [Member] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Bulk / Distributed products [Member] Bulk / Distributed products [Member] Bulk / Distributed products [Member] Specialty / Manufactured products [Member] Specialty / Manufactured products [Member] Specialty / Manufactured products [Member] Other [Member] Other [Member] Other [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer Relationships [Member] Trademarks [Member] Trademarks [Member] Other finite-life intangible assets [Member] Other Finite Life Intangible Assets [Member] Other finite-life intangible assets. Summary of Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-life intangible assets, Gross Carrying Amount Finite-Lived Intangible Assets, Gross Finite-life intangible assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Total finite-life intangible assets, Net Finite-Lived Intangible Assets, Net Indefinite-life intangible assets gross Indefinite Lived Intangible Assets Excluding Goodwill Gross Indefinite-life intangible assets gross. Indefinite-life intangible assets, Accumulated Amortization Indefinite Intangible Assets Accumulated Amortization Indefinite-life intangible assets amortization. Indefinite-life intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Total Intangible Assets, Gross Intangible Assets, Gross (Excluding Goodwill) Total intangible assets, net Intangible Assets, Net (Excluding Goodwill) Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Earnings Per Share [Abstract] Shares or stock options excluded from the calculation of diluted EPS Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income Tax [Abstract] Income Tax [Abstract] Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Document and Entity Information [Abstract] Document and entity information. Document Information [Table] Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Summary of basic and diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Inventory Disclosure [Abstract] Summary of Inventories Inventory, Net [Abstract] Inventory (FIFO basis) Inventory, Finished Goods, Gross LIFO reserve Inventory, LIFO Reserve Net inventory Inventory, Net Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Reconciliation to cash flows: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of debt issuance costs Amortization of Debt Issuance Costs Gain on deferred compensation assets Gain (Loss) on Investments Stock compensation expense Share-based Compensation Loss on property disposals Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Changes in operating accounts providing (using) cash: Increase (Decrease) in Operating Capital [Abstract] Trade receivables Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Income taxes Increase (Decrease) in Income Taxes Payable Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Other Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash dividends paid Payments of Ordinary Dividends, Common Stock New shares issued Proceeds from Stock Plans Shares surrendered for payroll taxes Payments Related to Tax Withholding for Share-based Compensation Net (payments on) proceeds from revolver borrowings Proceeds from (Repayments of) Debt Payments on term loan borrowings Repayments of Secured Debt Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities NET DECREASE IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS, END OF PERIOD SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid, Net Cash paid for interest Interest Paid Noncash investing activities - capital expenditures in accounts payable Capital Expenditures Incurred but Not yet Paid Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Term Loan [Member] Term Loan [Member] Term Loan [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt Long-term Debt Less: unamortized debt issuance costs Unamortized Debt Issuance Expense Total debt, net of debt issuance costs Total debt, net of debt issuance costs total debt, net of debt issuance costs Less: current portion of long-term debt Long-term Debt, Current Maturities Total long-term debt Long-term Debt, Excluding Current Maturities Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Interest rate swap Cash Flow Hedge Derivative Instrument Assets at Fair Value Deferred compensation plan assets Deferred Compensation Plan Assets Schedule of intangible assets and goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Earnings per Share Earnings Per Share [Text Block] Inventories Inventory Disclosure [Text Block] Statement of Financial Position [Abstract] Allowance for doubtful accounts, trade receivables Allowance for Doubtful Accounts Receivable, Current Shares authorized Common Stock, Shares Authorized Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Revenue Recognition, Deferred Revenue [Policy Text Block] Revenue Recognition, Deferred Revenue [Policy Text Block] Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Unrecognized Tax Benefits Unrecognized Tax Benefits Business Combination, Indemnification Assets, Amount as of Acquisition Date Business Combination, Indemnification Assets, Amount as of Acquisition Date Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Trade receivables — less allowance for doubtful accounts: $670 as of September 30, 2018 and $942 as of April 1, 2018 Accounts Receivable, Net, Current Inventories Income taxes receivable Income Taxes Receivable, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current PROPERTY, PLANT, AND EQUIPMENT: Property, Plant and Equipment [Abstract] PROPERTY, PLANT, AND EQUIPMENT: Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net property, plant, and equipment Property, Plant and Equipment, Net OTHER ASSETS: Other Assets [Abstract] Goodwill Goodwill Intangible assets, net Other Other Assets, Noncurrent Total other assets Other Assets Total assets Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] CURRENT LIABILITIES: Liabilities, Current [Abstract] Accounts payable — trade Accounts Payable, Current Dividends payable Dividends Payable, Current Accrued payroll and employee benefits Employee-related Liabilities, Current Income tax payable Accrued Income Taxes, Current Current portion of long-term debt Container deposits Other Deferred Compensation Arrangements, Liability, Current Other current liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current LONG-TERM DEBT, LESS CURRENT PORTION PENSION WITHDRAWAL LIABILITY Liability, Defined Benefit Pension Plan, Noncurrent DEFERRED INCOME TAXES Deferred Tax Liabilities, Net, Noncurrent OTHER LONG-TERM LIABILITIES Other Liabilities, Noncurrent Total liabilities Liabilities COMMITMENTS AND CONTINGENCIES Commitments and Contingencies SHAREHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Common stock; authorized: 30,000,000 shares of $0.05 par value; 10,679,469 and 10,631,992 shares issued and outstanding as of September 30, 2018 and April 1, 2018, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders’ equity Liabilities and Equity Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Summary of basic and diluted EPS Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted-average common shares outstanding—basic Dilutive impact of performance units and restricted stock Weighted Average Number Diluted Shares Outstanding Adjustment Weighted-average common shares outstanding—diluted Summary of Inventories Schedule of Inventory, Current [Table Text Block] Share Repurchase Program [Abstract] Share Repurchase Program [Abstract] Share Repurchase Program Stockholders' Equity Note Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Litigation, Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Performance-Based Restricted Stock [Member] Performance Shares [Member] Restricted Stock Awards [Member] Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Summary of performance-based restricted stock units Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Environmental Remediation Expense Environmental Remediation Expense Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segment [Domain] Industrial [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments (segments) Number of Reportable Segments Intersegment sales Intersegment Sales Intersegment sales. Number of operating segments aggregated (segments) Number of Operating Segments Aggregated Number of operating segments aggregated. Number of customer representing 10 percent or more of revenue (customers) Entity Wide Revenue Major Customer Number of Customers Entity wide revenue major customer number of customers. Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Gross profit Selling, general, and administrative expenses Operating income Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Statement of Comprehensive Income [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) on interest rate swap Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Restricted stock activity Restricted Stock Activity [Abstract] Restricted stock activity. Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested at beginning of period (Shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (Shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (Shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited or expired (Shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unvested at end of period (Shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning Balance, Weighted average grant date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted average grant date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Ending Balance, Weighted average grant date fair value (usd per share) Range of restricted stock to be issued minimum (shares) Range of Restricted Stock to be Issued Minimum Range of restricted stock to be issued minimum. Range of restricted stock to be issued maximum (shares) Range of Restricted Stock to be Issued Maximum Range of restricted stock to be issued maximum. Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Compensation expense Allocated Share-based Compensation Expense Restricted stock awards outstanding (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Number Restricted stock awards, weighted average exercise price (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Exercise Price Schedule of Goodwill [Table] Schedule of Goodwill [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Goodwill [Line Items] Goodwill [Line Items] Goodwill Debt Debt Disclosure [Text Block] Derivative [Table] Derivative [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period Two [Member] Debt Instrument, Redemption, Period Two [Member] Debt Instrument, Redemption, Period Three [Member] Debt Instrument, Redemption, Period Three [Member] Energy [Axis] Energy [Axis] Energy [Domain] Energy [Domain] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Position [Axis] Position [Axis] Position [Domain] Position [Domain] Derivative [Line Items] Derivative [Line Items] Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Derivative, Notional Amount Derivative, Notional Amount Cash Flow Hedge Derivative Instrument Assets at Fair Value Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Finished goods (LIFO basis) LIFO Inventory Amount Increase (decrease) in LIFO reserve Inventory, LIFO Reserve, Period Charge