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Credit Facility and Debt (Details) - USD ($)
 9 Months Ended 12 Months Ended
Mar. 29, 2019
Mar. 30, 2018
Jun. 29, 2018
Sep. 28, 2018
Mar. 28, 2014
Line of Credit Facility [Line Items]          
Outstanding borrowings $ 9,000,000   $ 9,000,000    
Silicon Valley Bank          
Line of Credit Facility [Line Items]          
Credit facility, maximum borrowing capacity     $ 30,000,000    
Available credit under credit facility 9,800,000        
Line of credit facility, current borrowing capacity $ 19,700,000        
Weighted-average interest rate     5.90%    
Additional spread on applicable rate in event of default 5.00%        
Silicon Valley Bank | Prime Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 2.75%        
Silicon Valley Bank | Minimum | Prime Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.50%        
Silicon Valley Bank | Maximum | Prime Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.50%        
Silicon Valley Bank | Singapore Line of Credit          
Line of Credit Facility [Line Items]          
Credit facility sublimit available for Singapore     $ 30,000,000    
Silicon Valley Bank | Line of Credit          
Line of Credit Facility [Line Items]          
Outstanding borrowings $ 9,000,000   9,000,000    
Weighted-average interest rate 6.00% 5.50%      
Quick assets, percent of unbilled receivables threshold       50.00%  
Quick assets, amount of unbilled receivables threshold       $ 7,000,000  
Silicon Valley Bank | Letter of Credit          
Line of Credit Facility [Line Items]          
Credit facility, maximum borrowing capacity         $ 12,000,000
Letters of credit outstanding $ 900,000        
Bank of New Zealand | New Zealand          
Line of Credit Facility [Line Items]          
Line of credit facility, amount outstanding 100,000        
Bank of New Zealand | Line of Credit | New Zealand          
Line of Credit Facility [Line Items]          
Credit facility, maximum borrowing capacity 400,000        
Bank of New Zealand | Short-term Advances | New Zealand          
Line of Credit Facility [Line Items]          
Credit facility, maximum borrowing capacity $ 299,000   $ 300,000.0    
Singapore subsidiary | Silicon Valley Bank | Prime Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 2.00%