Income Taxes - Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 03, 2020	Apr. 28, 2019	Apr. 29, 2018
Income Tax Disclosure [Abstract]
beginning balance		$ 903	$ 844	$ 12,245
increases from prior period tax positions		106	135	350
decreases from prior period tax positions	[1]	(85)	(76)	(11,751)
increases from current period tax positions		434
decreases from current period tax positions		(89)
ending balance		$ 1,269	$ 903	$ 844

[1] The $11.8 million reduction in our unrecognized income tax benefits during fiscal 2018 is mostly associated with the reduction in our U.S. Federal income tax rate pursuant to the TCJA on the effective settlement of an IRS exam.