Net Earnings (Loss) Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jan. 30, 2021	Oct. 31, 2020	Aug. 01, 2020	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	Jan. 30, 2021	Jan. 25, 2020	Dec. 14, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock Repurchase Program, Authorized Amount									$ 50,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 26,669						$ 26,669
Shares Paid for Tax Withholding for Share Based Compensation	4,000						414,174
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,005,236			3,682,169			3,234,606	1,348,949
Net Income (Loss) Attributable to Parent	$ (48,289)	$ 7,515	$ (46,652)	$ (1,693)	$ 35,931	$ (32,155)	$ (87,426)	$ 2,083
Weighted Average Number of Shares Outstanding, Basic	50,082,000			48,298,000			49,099,000	47,911,000
Average dilutive restricted stock units	0			0			0	403,000
Average dilutive performance shares	0			0			0	9,000
Average dilutive restricted shares	0			0			0	12,000
Average Dilutive Performance Share Units	0			0			0	432,000
Average dilutive stock options	0			0			0	0
Earnings Per Share, Basic	$ (0.96)			$ (0.04)			$ (1.78)	$ 0.04
Earnings Per Share, Diluted	$ (0.96)			$ (0.04)			$ (1.78)	$ 0.04
Weighted Average Number of Shares Outstanding, Basic and Diluted							49,099,000	47,911,000
Net Income (Loss) Available to Common Stockholders, Basic	$ (48,289)			$ (1,693)			$ (87,426)	$ 2,082
Weighted Average Number of Shares Outstanding, Diluted	50,082,000			48,298,000			49,099,000	48,767,000
Undistributed Earnings, Basic	$ 0			$ 0			$ 0	$ 1
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	0			0			0	(1)
Net Income (Loss) Attributable to Parent, Diluted	(48,289)			(1,693)			(87,426)	2,082
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	0			$ 0			$ 0	$ (1)
Proceeds from Issuance of Common Stock	$ 15,000
Stock Issued During Period, Shares, Treasury Stock Reissued	2,307,692
Sale of Stock, Price Per Share	$ 6.50						$ 6.50
Contract with Customer, Liability	$ 4,131						$ 4,131
Contract with Customer, Liability, Current	175						175
Contract with Customer, Liability, Noncurrent	$ 3,956						$ 3,956