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Business Acquisitions - Allocation of Purchase Price of Assets Acquired and Liabilities Assumed Based on the Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 01, 2016
Mar. 31, 2018
Apr. 01, 2017
Apr. 02, 2016
Jan. 15, 2015
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables         $ 268
Goodwill   $ 2,626 $ 3,027 $ 7,445  
Cash paid to acquire subsidiaries   $ 0 $ 2,010 $ 0  
Visicon [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables $ 391        
Goodwill 2,626        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets 26        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 6,226        
Payments to Acquire Businesses, Gross 2,000        
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory 982        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 737        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 116        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 3,300        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities $ (1,952)