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Revenue from Contracts with Customers - Summary of the activity associated with deferred revenue (Detail) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2021
Nov. 01, 2020
Revenue From Contract With Customer [Abstract]    
Beginning balance $ 540 [1] $ 502
Revenue recognized on contract liabilities (1,445) (1,197)
Payments received for services not yet rendered 1,584 1,070
Ending balance $ 679 $ 375
[1] Derived from audited financial statements.