Revenue from Contracts with Customers - Summary of the activity associated with deferred revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 01, 2021		Aug. 02, 2020
Revenue From Contract With Customer [Abstract]
Beginning balance	$ 540	[1]	$ 502
Revenue recognized on contract liabilities	(611)		(593)
Payments received for services not yet rendered	765		776
Ending balance	$ 694		$ 685

[1] Derived from audited financial statements.