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Stock-based Compensation and Stockholders' Equity (Tables)
3 Months Ended
Aug. 25, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table summarizes stock-based compensation by income statement line item:
 
Three Months Ended
(In thousands)
August 25, 2019
 
August 26, 2018
Cost of sales
$
(26
)
 
$
101

Research and development
30

 
25

Selling, general and administrative
524

 
602

Total stock-based compensation
$
528

 
$
728