Product Warranty (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Product Warranty
Product warranty accrual, beginning	$ 4,215	$ 5,193	$ 4,215	$ 5,411
Warranty charges incurred, net	(1,780)	(1,722)	(3,720)	(3,543)
Provision for warranty charges	1,445	2,092	2,657	3,695
Product warranty accrual, ending	$ 3,487	$ 5,563	$ 3,152	$ 5,563