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Debt (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]    
Document Fiscal Year (linked throughout the document) - not tagged 2021  
Accumulated amortization balances $ 8,744,000 $ 6,645,000
Long-term Debt, Gross 254,900,000 259,350,000
Outstanding borrowings (5,946,000) (8,044,000)
Long-term Debt 248,954,000 251,306,000
Current portion of long-term debt 4,450,000 4,450,000
Long-term Debt, Excluding Current Maturities 244,504,000 246,856,000
Maturities of Long-term Debt [Abstract]    
2015 4,450,000  
2016 4,450,000  
2017 4,450,000  
2018 241,550,000  
Thereafter 0  
STAHL [Member] | New Revolving Credit Facility    
Debt Instrument [Line Items]    
Accumulated amortization balances 2,313,000 1,766,000
STAHL [Member] | Other Current Liabilities [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Periodic Payment, Principal $ 4,450,000 $ 51,113,000