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, 2013
Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period $ 2.3 $ 2.7
Charged to expense 1.0  
Recoveries (1.2) (0.4)
Balance at end of period $ 2.1 $ 2.3