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Stock-based Compensation and Stockholders' Equity (Tables)
9 Months Ended
Feb. 28, 2021
Share-based Payment Arrangement [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 EndedNine Months Ended
(In thousands)February 28, 2021February 23, 2020February 28, 2021February 23, 2020
Cost of sales$107 $(14)$289 $42 
Research and development49 10 175 88 
Selling, general and administrative641 570 2,120 1,751 
Total stock-based compensation $797 $566 $2,584 $1,881