Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Mar. 28, 2015
Product Warranty
Product Warranty Accrual, Noncurrent			$ 1,195		$ 0
Product warranty accrual, beginning	$ 3,342	$ 3,487	3,342	$ 4,215
Warranty charges incurred, net	(2,063)	(1,780)	(3,547)	(3,720)
Provision for warranty charges	2,493	1,445	4,656	2,657
Product warranty accrual, ending	$ 4,021	$ 3,152	$ 4,451	$ 3,152