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

Accounts and Other Receivables - Allowance for Doubtful Accounts (Detail)

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Accounts and Other Receivables - Allowance for Doubtful Accounts (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Receivables [Abstract]    
Balance at beginning of period $ 2.1 $ 2.3
Charged to expense 0.2 1.0
Write-offs, net of recoveries (1.3) (1.2)
Balance at end of period $ 1.0 $ 2.1