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, 2015
Mar. 31, 2014
Receivables [Abstract]    
Balance at beginning of period $ 1.0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2.1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Adjustment to provision (0.1)us-gaap_ProvisionForDoubtfulAccounts 0.2us-gaap_ProvisionForDoubtfulAccounts
Write-offs, net of recoveries (0.1)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (1.3)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Balance at end of period $ 0.8us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1.0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent