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Debt (Details) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Amended Credit Facility [Abstract]      
Debt issuance costs $ 973,000 $ 1,815,000 $ 462,000
Cash 49,616,000 9,911,000  
Summarized information about the term loan [Abstract]      
Less current portion of term loan (3,678,000) (3,685,000)  
Long-term portion of term loan 20,462,000 $ 24,187,000  
COVID-19 [Member]      
Amended Credit Facility [Abstract]      
Cash $ 49,616,000    
Revolving Facility [Member]      
Amended Credit Facility [Abstract]      
Interest rate at end of period 3.64% 5.24%  
Credit for cash $ 6,000,000    
Term Loans [Member]      
Amended Credit Facility [Abstract]      
Quarterly principal payments $ 937,500    
Interest rate at end of period 4.34% 5.24%  
Summarized information about the term loan [Abstract]      
Principal amount of term loan $ 24,375,000 $ 28,125,000  
Unamortized financing fees (235,000) (253,000)  
Net carrying amount of term loan 24,140,000 27,872,000  
Less current portion of term loan (3,678,000) (3,685,000)  
Long-term portion of term loan 20,462,000 24,187,000  
Future repayments of the Amended Term Loan, by fiscal year [Abstract]      
2021 3,750,000    
2022 3,750,000    
2023 3,750,000    
2024 13,125,000    
Total payments 24,375,000 28,125,000  
Second Amended Credit Facility [Member]      
Amended Credit Facility [Abstract]      
Debt issuance costs 973,000    
Second Amended Credit Facility [Member] | Maximum [Member]      
Amended Credit Facility [Abstract]      
Maximum sale and lease back transactions 5,000,000    
Second Amended Credit Facility [Member] | Revolving Facility [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity 238,620,000    
Outstanding balance under revolving loan 152,000,000    
Amount available under revolving facility 58,461,000    
Second Amended Credit Facility [Member] | Revolving Facility [Member] | Canadian Borrowers [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity 24,000,000    
Second Amended Credit Facility [Member] | Revolving Facility [Member] | Letters of Credit [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity 20,000,000    
Outstanding balance under revolving loan 3,579,000    
Second Amended Credit Facility [Member] | Revolving Facility [Member] | Swing Line Sublimit [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity $ 23,862,000    
Credit Facility [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity   230,000,000  
Debt instrument, maturity date Jun. 05, 2023    
Credit Facility [Member] | Minimum [Member]      
Amended Credit Facility [Abstract]      
Facility fee on total leverage ratio 0.375%    
Credit Facility [Member] | Maximum [Member]      
Amended Credit Facility [Abstract]      
Dividend payments and share repurchases, annual maximum amount permitted $ 20,000,000    
Facility fee on total leverage ratio 0.50%    
Credit Facility [Member] | LIBOR [Member]      
Amended Credit Facility [Abstract]      
Reference interest rate under option 1, floor 2.25%    
Interest rate over LIBOR rate under option 1 2.50%    
Interest rate above base rate under option 2 2.75%    
Credit Facility [Member] | Reference Rate [Member]      
Amended Credit Facility [Abstract]      
Reference interest rate under option 1, floor 1.25%    
Interest rate over LIBOR rate under option 1 1.50%    
Interest rate above base rate under option 2 1.75%    
Credit Facility [Member] | Revolving Facility [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity   200,000,000  
Outstanding balance under revolving loan   110,400,000  
Credit Facility [Member] | Revolving Facility [Member] | Canadian Borrowers [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity   20,000,000  
Credit Facility [Member] | Revolving Facility [Member] | Letters of Credit [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity   15,000,000  
Credit Facility [Member] | Term Loans [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity   $ 30,000,000