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Revenue from Contracts with Customers - Summary of the activity for deferred revenue (Detail) - USD ($)
$ in Thousands
9 Months Ended
Feb. 02, 2020
Jan. 27, 2019
Revenue From Contract With Customer [Abstract]    
Beginning balance $ 399 [1] $ 809
Revenue recognized on contract liabilities (1,917) (2,171)
Payments received for services not yet rendered 1,916 1,854
Ending balance $ 398 $ 492
[1] Derived from audited financial statements.