Income Taxes - Components of Net Deferred Tax Assets (Details) (USD $)	12 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Current
Inventory valuation and warranty costs	$ 13,650,000	$ 11,779,000
Receivables and other current assets	(311,000)	(217,000)
Payroll-related accruals	1,594,000	1,901,000
Accrued liabilities	926,000	2,226,000
Deferred revenue	2,900,000	3,182,000
Other	(161,000)	15,000
Total current deferred tax assets	18,598,000	18,886,000
Valuation allowance, current	(18,607,000)	(17,204,000)
Deferred Tax Assets, Net	(9,000)
Net current deferred tax assets	161,000	1,682,000
Non-current
Deferred compensation	6,482,000	6,745,000
Intangible assets and investments	2,446,000	(1,431,000)
Accrued liabilities	186,000	523,000
Property, plant and equipment	4,634,000	4,967,000
Other comprehensive income	(253,000)	(302,000)
Tax loss and credit carryforwards	42,324,000	36,442,000
Other	0	427,000
Total non-current deferred tax asset	57,292,000	47,371,000
Valuation allowance, non-current	(56,588,000)	(43,605,000)
Net non-current deferred tax assets	704,000	3,766,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	1,473,000
Total deferred tax assets	75,890,000	66,257,000
Total valuation allowance	(75,195,000)	(60,809,000)
Net deferred tax assets	695,000
Increase in valuation allowance	$ (14,400,000)