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Debt (Details) - USD ($)
6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Amended Credit Facility [Abstract]      
Debt issuance costs $ 901,000 $ 1,757,000  
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 $ 22,299,000   $ 24,187,000
Revolving Facility [Member]      
Amended Credit Facility [Abstract]      
Interest rate at end of period 4.84%   5.24%
Term Loans [Member]      
Amended Credit Facility [Abstract]      
Quarterly principal payments $ 937,500    
Interest rate at end of period 4.86%   5.24%
Summarized information about the term loan [Abstract]      
Principal amount of term loan $ 26,250,000   $ 28,125,000
Unamortized financing fees (273,000)   (253,000)
Net carrying amount of term loan 25,977,000   27,872,000
Less current portion of term loan (3,678,000)   (3,685,000)
Long-term portion of term loan 22,299,000   24,187,000
Future repayments of the Term Loan, by fiscal year [Abstract]      
2020 - remaining six months 1,875,000    
2021 3,750,000    
2022 3,750,000    
2023 3,750,000    
2024 13,125,000    
Total payments 26,250,000   28,125,000
Second Amended Credit Facility [Member]      
Amended Credit Facility [Abstract]      
Debt issuance costs 901,000    
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    
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    
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 144,000,000   $ 110,400,000
Amount available under revolving facility 74,029,000    
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    
Outstanding balance under revolving loan 4,039,000    
Credit Facility [Member] | Term Loans [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity $ 30,000,000