Computation of Earnings Per Common Share - Basic and Diluted Earnings Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 31, 2021	Jul. 25, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income available to common stockholders (numerator)	$ 18,165	$ 37,024	$ 19,063	$ 4,606
Weighted-average number of common shares (in shares)	30,431,143	31,750,547	30,553,381	31,677,012
Basic earnings per common share (in dollars per share)	$ 0.60	$ 1.17	$ 0.62	$ 0.15
Potential common stock arising from stock options, and unvested restricted share units (in shares)	441,363	377,551	532,604	270,334
Total shares-diluted (in shares)	30,872,506	32,128,098	31,085,985	31,947,346
Diluted earnings per common share (in dollars per share)	$ 0.59	$ 1.15	$ 0.61	$ 0.14
Anti-dilutive weighted shares excluded from the calculation of earnings per common share:
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	1,429,592	3,539,999	1,291,311	6,117,998
Stock-based awards
Anti-dilutive weighted shares excluded from the calculation of earnings per common share:
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	226,894	367,191	88,613	371,068
Convertible senior notes
Anti-dilutive weighted shares excluded from the calculation of earnings per common share:
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	601,349	1,586,404	601,349	2,873,465
Note Warrant
Anti-dilutive weighted shares excluded from the calculation of earnings per common share:
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	601,349	1,586,404	601,349	2,873,465