Business Acquisitions - Allocation of Purchase Price of Assets Acquired and Liabilities Assumed Based on the Fair Value (Details) - USD ($)		12 Months Ended
	Jan. 15, 2015	Apr. 02, 2016	Mar. 28, 2015	Mar. 29, 2014
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	$ 268,000
Goodwill		$ 7,445,000	$ 7,717,000
Cash paid to acquire subsidiaries		0	7,737,000	$ 9,731,000
Gain on acquisition of Semiconductor Systems business		$ 0	$ 0	$ 499,000
Topwin [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	454,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	10,500,000
Payments to Acquire Businesses, Gross	7,600,000
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory	544,000
Prepaid Expense and Other Assets, Current	295,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	23,000
Business Combination, Acquired Intangibles	3,618,000
Goodwill, Gross	7,445,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities	$ 1,859,000