Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative Instruments - Additional Information (Detail)

v3.8.0.1
Derivative Instruments - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Derivative [Line Items]      
Derivative weighted average fixed interest rate 2.10%    
Weighted average remaining life of contracts 1 year 4 months 24 days    
Unrealized gain (loss) on interest rate swap contracts $ 1,500,000 $ 2,600,000 $ (600,000)
Realized loss on interest rate swap contracts 800,000 1,300,000 $ 1,900,000
Derivatives not accounted for as hedges      
Derivative [Line Items]      
Notional amount of derivatives 100,800,000 100,000,000  
Interest rate swap contracts included in Accounts Receivable 400,000 0  
Interest rate swap contracts included in Accounts Payable 0 1,100,000  
Interest rate swap contracts      
Derivative [Line Items]      
Interest rate swap contracts included in Accounts Receivable 400,000    
Interest rate swap contracts included in Accounts Payable   1,100,000  
Interest rate swap contracts | Derivatives not accounted for as hedges      
Derivative [Line Items]      
Notional amount of derivatives 100,000,000 100,000,000  
Interest rate swap contracts included in Accounts Receivable 400,000 0  
Interest rate swap contracts included in Accounts Payable 0 1,100,000  
Foreign currency forward contracts | Derivatives not accounted for as hedges      
Derivative [Line Items]      
Notional amount of derivatives 800,000 0  
Interest rate swap contracts included in Accounts Receivable 0 0  
Interest rate swap contracts included in Accounts Payable 0 0  
Foreign currency forward contracts | Derivatives not accounted for as hedges | Cash flow hedging      
Derivative [Line Items]      
Unrealized gain associated with the forward contracts not designated as a cash flow hedging arrangement $ 0 $ 0