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Acquisitions (Narratives) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ (2,638,000) | $ 0 | $ 0
Revenue from Contract with Customer, Excluding Assessed Tax |  | 649,642,000 | 809,162,000 | 876,282,000
Gain (Loss) on Disposition of Business |  | 0 | (176,000) | (25,672,000)
Impairment of Long-Lived Assets Held-for-use |  |  |  | 27,753,000
Net sales: |  | $ 649,642,000 | 809,162,000 | 876,282,000
Estimated useful life |  | 18 years |  |
Long-term Debt |  | $ 248,954,000 | $ 251,306,000 |
Common Stock, Shares, Issued |  | 23,984,299 | 23,771,620 |
Voting common stock: 50,000,000 shares authorized; 23,984,299 and 23,771,620 shares issued and outstanding |  | $ 240,000 | $ 238,000 |
Debt Issuance Costs, Net |  | 0 |  |
Gross balance of deferred costs |  | $ 14,690,000 | 14,690,000 |
Stock Issued During Period, Shares, New Issues |  | 4,312,500 |  |
Shares Issued, Price Per Share |  | $ 48.00 |  |
Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Extinguishment of Debt, Amount | $ 6,272,000 |  |  |
Line of Credit |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gross balance of deferred costs |  | $ 3,615,000 | 2,789,000 |
Line of Credit | Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gross balance of deferred costs |  | 4,027,000 |  |
Estimate of Fair Value Measurement | Office Building |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Proceeds from Sale of Buildings |  | 6,363,000 |  |
United States |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net sales: |  | 348,986,000 | 450,242,000 | 485,969,000
Business Exit Costs |  | 1,797,000 | 2,958,000 | 1,473,000
Cost of Sales [Member] | FRANCE |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Exit Costs |  | 815,000 |  |
Selling and Marketing Expense [Member] | FRANCE |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Exit Costs |  | 94,000 |  |
General and Administrative Expense | FRANCE |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Exit Costs |  | 327,000 |  |
Asia Pacific [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | 2,638,000 |  |
Asia Pacific [Member] | Cost of Sales [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | 2,189,000 |  |
Business Exit Costs |  | 1,455,000 |  |
Asia Pacific [Member] | Selling and Marketing Expense [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Exit Costs |  | 296,000 |  |
Asia Pacific [Member] | General and Administrative Expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ 449,000 |  |
Engineered drawings |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life |  | 5 years |  |
Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life |  | 18 years |  |
STAHL [Member] | Line of Credit |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Secured Long-term Debt, Noncurrent |  | $ (445,000,000) |  |
STAHL [Member] | Line of Credit | Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Extinguishment of Debt, Amount | 326,000 |  |  |
Gross balance of deferred costs |  | 977,000 |  |
STAHL [Member] | New Revolving Credit Facility |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Secured Long-term Debt, Noncurrent |  | (100,000,000) |  |
STAHL [Member] | New Revolving Credit Facility | Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Extinguishment of Debt, Amount | 5,946,000 |  |  |
Dorner |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Secured Long-term Debt, Noncurrent |  | (750,000,000) |  |
Payments to Acquire Businesses, Gross |  | 485,000,000 |  |
Dorner | Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gross balance of deferred costs |  | 5,432,000 |  |
Stock Issued During Period, Value, New Issues | 198,720,000 |  |  |
Proceeds from Issuance of Common Stock | 207,000,000 |  |  |
Dorner | Line of Credit |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Secured Long-term Debt, Noncurrent |  | (100,000,000) |  |
Dorner | Line of Credit | Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gross balance of deferred costs |  | 3,050,000 |  |
Dorner | Bridge Loan |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Secured Long-term Debt, Noncurrent |  | (650,000,000) |  |
Dorner | Bridge Loan | Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Unamortized Debt Issuance Expense | $ 8,531,000 |  |  |
Dorner | General and Administrative Expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Transaction Costs |  | $ 3,951,000 |  |
Goodwill [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  | $ 6,174,000 |
Engineered drawings |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  | 1,872,000
Property, Plant and Equipment [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  | 12,830,000
Inventories [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  | 6,877,000
Sarasota [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | 1,059,000
CES and STB [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | 26,731,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  | 34,195,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  |  | $ (3,623,000)

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