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

Inventories - Additional Information (Detail)

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Inventories - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Inventory Net [Line Items]    
Finished goods inventory balance $ 19.2 $ 12.5