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Accounts and Notes Receivable - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]    
Notes Receivable, total $ 8.3  
Notes Receivable interest rate 3.60%  
Notes Receivable, maturity description Remaining unpaid amounts, plus accrued interest, mature in 2026.  
Discontinued Operations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts $ 8.0 $ 9.3