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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)