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

Property, Plant and Equipment - Components of Property, Plant and Equipment (Parenthetical) (Detail)

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Property, Plant and Equipment - Components of Property, Plant and Equipment (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Property Plant And Equipment Capitalized Interest Costs [Abstract]  
Capitalized interest $ 1.7us-gaap_InterestPaidCapitalized