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Debt (Narratives) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Line of Credit Facility [Line Items]      
New Credit Agreement 2017 $ 545,000,000    
Outstanding letters of credit 17,302,000    
Payments of financing costs 826,000 $ 0 $ 0
Carrying amount of the Company's revolving credit facility $ 254,900,000 $ 259,350,000  
Stated interest rate percentage 2.50% 3.00%  
Long-term Debt, Current Maturities $ 4,450,000 $ 4,450,000  
Line of Credit Facility, Fair Value of Amount Outstanding 0    
Gross balance of deferred costs 14,690,000 14,690,000  
Accumulated amortization balances 8,744,000 6,645,000  
Debt obligations 2,580,000    
Amount drawn on unsecured credit lines 0    
Debt Instrument, Unamortized Discount, Noncurrent (5,946,000) (8,044,000)  
Long-term Debt $ (248,954,000) (251,306,000)  
Long-term Debt, Term 7 years    
Line of Credit Facility, Current Borrowing Capacity $ 100,000,000    
2015 4,450,000    
Minimum      
Line of Credit Facility [Line Items]      
Outstanding letters of credit 537,000    
Foreign Line of Credit      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 15,478,000    
Outstanding borrowings 12,598,000    
Line of Credit      
Line of Credit Facility [Line Items]      
Gross balance of deferred costs 3,615,000 2,789,000  
Bridge Loan      
Line of Credit Facility [Line Items]      
Repayments of Secured Debt 198,720,000    
Standby Letters of Credit      
Line of Credit Facility [Line Items]      
Outstanding letters of credit 16,765,000    
STAHL [Member]      
Line of Credit Facility [Line Items]      
Secured Debt, Current 4,450,000    
STAHL [Member] | Line of Credit      
Line of Credit Facility [Line Items]      
Secured Long-term Debt, Noncurrent 445,000,000    
STAHL [Member] | New Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Secured Long-term Debt, Noncurrent 100,000,000    
Accumulated amortization balances 2,313,000 1,766,000  
STAHL [Member] | Other Current Liabilities [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Periodic Payment, Principal 4,450,000 $ 51,113,000  
Dorner      
Line of Credit Facility [Line Items]      
Secured Long-term Debt, Noncurrent 750,000,000    
2015 4,500,000    
Dorner | Line of Credit      
Line of Credit Facility [Line Items]      
Secured Long-term Debt, Noncurrent 100,000,000    
Dorner | Bridge Loan      
Line of Credit Facility [Line Items]      
Secured Long-term Debt, Noncurrent $ 650,000,000