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Cash Flow Information - Schedule of Other Significant Noncash Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2022
May 01, 2021
May 02, 2020
Supplemental Cash Flow Information [Abstract]      
Demonstration equipment transferred to inventory $ 53 $ 56 $ 10
Purchases of property and equipment included in accounts payable 4,177 667 1,951
Contributions of common stock under the ESPP $ 1,211 $ 565 $ 2,311