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Product Warranty Accrual (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Product Warranty
Product warranty accrual, beginning	$ 4,545	$ 4,708	$ 4,187	$ 4,415
Warranty charges incurred, net	(1,866)	(1,800)	(3,910)	(3,951)
Provision for warranty charges	3,417	2,209	5,819	4,653
Product warranty accrual, ending	$ 6,096	$ 5,117	$ 6,096	$ 5,117

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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