Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014
Disclosure Accrued Liabilities [Abstract]
Payroll-related liabilities	$ 6,766		$ 6,723
Product Warranty Accrual, Current	3,256
Product warranty accrual	4,451	$ 4,021	3,342	$ 3,152	$ 3,487	$ 4,215
Purchase order commitments and receipts	2,557		1,815
Professional fees payable	1,285		1,237
Restructuring costs payable	1,552		1,997
Other	3,497		3,552
Accrued liabilities	$ 18,913		$ 18,666