Revenue from Contracts with Customers - Summary of the activity associated with deferred revenue (Detail) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2021		Feb. 02, 2020
Revenue From Contract With Customer [Abstract]
Beginning balance	$ 502	[1]	$ 399
Revenue recognized on contract liabilities	(1,893)		(1,917)
Payments received for services not yet rendered	1,619		1,916
Ending balance	$ 228		$ 398

[1] Derived from audited financial statements.