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Revenue from Contracts with Customers - Summary of the activity for deferred revenue (Detail) - USD ($)
$ in Thousands
6 Months Ended
Nov. 03, 2019
Oct. 28, 2018
Revenue from Contract with Customer [Abstract]    
Beginning balance $ 399 [1] $ 809
Revenue recognized on contract liabilities (1,536) (1,534)
Payments received for services not yet rendered 1,512 1,374
Ending balance $ 375 $ 649
[1] Derived from audited financial statements.