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

Product Warranties - Summary of Changes in Product Warranty Provision (Detail)

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Product Warranties - Summary of Changes in Product Warranty Provision (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Product Warranty Accrual [Line Items]      
Balance at beginning of period $ 27.0 $ 26.2 $ 24.9
Accruals for product warranties 12.1 13.1 9.1
Settlements made in cash or in kind (12.0) (12.3) (7.8)
Balance at end of period $ 27.1 $ 27.0 $ 26.2