Balance Sheet Detail (Details) (USD $)	12 Months Ended
	Mar. 29, 2015	May 30, 2014	Mar. 30, 2014
Inventories, net
Raw materials	$ 4,709,000		$ 7,745,000
Work-in-process	18,377,000		18,436,000
Finished goods	22,324,000		23,441,000
Total inventories, net	45,410,000		49,622,000
Property, plant and equipment, net
Total property, plant and equipment, gross	351,789,000		349,675,000
Less: accumulated depreciation	(286,281,000)		(279,848,000)
Total property, plant and equipment, net	65,508,000		69,827,000
Other current liabilities
Accrued restructuring costs	10,512,000		638,000
Other	7,070,000		10,887,000
Total other current liabilities	17,582,000		11,525,000
Other long-term obligations
Deferred compensation related liabilities	13,143,000		13,786,000
Other	4,462,000		4,897,000
Total other long-term liabilities	17,605,000		18,683,000
Land
Property, plant and equipment, net
Land	11,578,000		11,724,000
Machinery and Equipment
Property, plant and equipment, net
Machinery and equipment	292,180,000		289,393,000
Building and Leasehold Improvements
Property, plant and equipment, net
Building and leasehold improvements	48,031,000		48,558,000
High-Speed Converter Business
Other long-term obligations
Fixed assets held-for-sale	0	2,900,000	2,900,000
Accrued severance costs	$ 10,200,000