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Revenue from Contracts with Customers - Summary of the activity for deferred revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 04, 2019
Jul. 29, 2018
Revenue from Contract with Customer [Abstract]    
Beginning balance $ 399 [1] $ 809
Revenue recognized on contract liabilities (483) (742)
Payments received for services not yet rendered 768 567
Ending balance $ 684 $ 634
[1] Derived from audited financial statements.