Common Stock Repurchases - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Equity, Class of Treasury Stock [Line Items]
Authorized value of share repurchases			$ 100
Repurchase of shares under the 2007 SRP	0	0	0	0
Remaining authorized amount for stock repurchase			$ 11.8

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration