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

Fair Value Measurements - Summary of Company's Financial Assets and Liabilities that were Accounted for at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Summary of Company's Financial Assets and Liabilities that were Accounted for at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap contracts included in Accounts Payable $ 3.7 $ 3.1
Fair Value Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap contracts included in Accounts Payable 3.7  
Total Liabilities 3.7  
Level 2 [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap contracts included in Accounts Payable 3.7  
Total Liabilities $ 3.7