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Debt - (Additional Information) (Details)
3 Months Ended 6 Months Ended
Aug. 04, 2017
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
USD ($)
Apr. 23, 2015
USD ($)
Debt Instrument [Line Items]                
Increase in borrowing capacity limit $ 325,000,000              
Company owned capital stock, percentage securing senior secured credit facility 65.00%              
Short-term debt   $ 34,351,000   $ 34,351,000     $ 54,490,000  
Short-term debt, weighted average interest rate   4.00%   4.00%        
Amortization expense relating to debt issuance costs and included in interest expense   $ 374,000 $ 314,000 $ 752,000 $ 627,000      
Deferred issuance costs, net of accumulated amortization   4,807,000   4,807,000     5,559,000  
5.00% Senior Notes due 2023                
Debt Instrument [Line Items]                
Long-term debt   300,000,000   300,000,000     300,000,000 $ 300,000,000
Interest rate               5.00%
Standby Letters of Credit                
Debt Instrument [Line Items]                
Available lines of credit   425,615,000   425,615,000     546,960,000  
Stand by letters of credit   3,955,000   3,955,000        
Outstanding amount   118,921,000   118,921,000     87,685,000  
Maximum                
Debt Instrument [Line Items]                
Consideration transferred       250,000        
Amended Credit Facility, due 2022 | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity $ 600,000,000           100,000,000  
Available lines of credit   389,000,000   389,000,000        
Amended Credit Facility, due 2022 | Secured Debt                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity             299,105,000  
Debt instrument, face amount $ 150,000,000              
Available lines of credit   433,625,000   433,625,000        
Current portion of long-term debt   $ 33,888,000   $ 33,888,000        
Amended 2017 Term Loan | Term Loan                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity             99,105,000  
Amended 2017 Term Loan | Secured Debt                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity           $ 133,050,000 449,105,000  
Amended 2017 Revolver | Secured Debt                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity             $ 700,000,000  
LIBOR | 2017 Revolver And 2017 Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.50%              
LIBOR | 2017 Revolver And 2017 Term Loan | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.25%              
LIBOR | 2017 Revolver And 2017 Term Loan | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.00%              
Federal Funds Effective Rate | 2017 Revolver And 2017 Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.50%              
Eurocurrency Base Rate | 2017 Revolver And 2017 Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.00%              
Debt Instrument Quarterly Installments Beginning December 31, 2018 Through December 30, 2019                
Debt Instrument [Line Items]                
Debt instrument, periodic payment $ 5,645,000              
Debt Instrument Quarterly Installments Beginning December 31, 2019 Through December 30, 2020                
Debt Instrument [Line Items]                
Debt instrument, periodic payment 8,468,000              
Debt Instrument Quarterly Installments Beginning December 31, 2020 Through September 29, 2022                
Debt Instrument [Line Items]                
Debt instrument, periodic payment 11,290,000              
Debt Instrument Final Installments Payable On September 30, 2022                
Debt Instrument [Line Items]                
Debt instrument, periodic payment $ 320,000,000              
Maximum Leverage Ratio                
Debt Instrument [Line Items]                
Debt Instrument, Measurement Input   4.00   4.00        
Maximum Leverage Ratio | Minimum                
Debt Instrument [Line Items]                
Debt Instrument, Measurement Input   3.50   3.50        
Maximum Leverage Ratio | Maximum                
Debt Instrument [Line Items]                
Debt Instrument, Measurement Input   4.00   4.00