Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Current
Inventory valuation and warranty costs	$ 10,781	$ 13,650
Receivables and other current assets	(272)	(311)
Payroll-related accruals	1,288	1,594
Accrued liabilities	2,382	926
Deferred revenue	3,368	2,900
Other	1,029	(161)
Total current deferred tax assets	18,576	18,598
Valuation allowance, current	(18,571)	(18,607)
Net current deferred tax assets	5	(9)
Non-current
Deferred compensation	4,704	6,482
Intangible assets and investments	(1,677)	2,446
Accrued liabilities	454	186
Property, plant and equipment	5,187	4,634
Other comprehensive income	(112)	(253)
Tax loss and credit carryforwards	59,137	42,324
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	1,049	1,473
Total non-current deferred tax asset	68,742	57,292
Valuation allowance, non-current	(69,011)	(56,588)
Net non-current deferred tax assets	(269)	704
Total deferred tax assets	87,318	75,890
Total valuation allowance	(87,582)	(75,195)
Net deferred tax assets	(264)	$ 695
Increase in valuation allowance	$ (12,400)