Computation of Earnings Per Common Share - Basic and Diluted Earnings Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										12 Months Ended
	Jan. 30, 2021	Oct. 24, 2020	Jul. 25, 2020	Apr. 25, 2020	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	Apr. 27, 2019	Jul. 28, 2018	Apr. 28, 2018	Jan. 30, 2021	Jan. 25, 2020	Jan. 26, 2019
Basic earnings per unit
Net income	$ (4,195)	$ 33,926	$ 37,024	$ (32,418)	$ (11,189)	$ 24,229	$ 29,896	$ 14,279			$ 34,337	$ 57,215	$ 62,907
Weighted-average number of common shares (in shares)											31,665,183	31,498,474	31,250,376
Basic earnings per common share (in dollars per share)	$ (0.13)	$ 1.06	$ 1.17	$ (1.03)	$ (0.35)	$ 0.77	$ 0.95	$ 0.45			$ 1.08	$ 1.82	$ 2.01
Diluted earnings per unit
Weighted-average number of common shares (in shares)											31,665,183	31,498,474	31,250,376
Potential common stock arising from stock options, and unvested restricted share units (in shares)											425,395	323,308	555,993
Potential shares of common stock issuable on exercise of convertible senior notes											0	0	183,799
Total shares-diluted (in shares)											32,090,578	31,821,782	31,990,168
Diluted earnings per common share (in dollars per share)	(0.13)	$ 1.05	$ 1.15	$ (1.03)	$ (0.35)	$ 0.76	$ 0.94	$ 0.45			$ 1.07	$ 1.80	$ 1.97
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)											3,665,932	9,748,412	9,958,448
Average stock price (in usd per share)									$ 99.27	$ 110.46
Proceeds from borrowings on senior credit agreement, including term loans											$ 1,056,000	$ 475,000	$ 423,188
Stock-based awards
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)											233,988	253,000	130,779
Convertible senior notes
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)											1,715,972	4,747,706	4,821,935
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share)	96.89										$ 96.89
Warrants
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)											1,715,972	4,747,706	5,005,734
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share)	$ 130.43										$ 130.43