Computation of Earnings Per Common Share - Basic and Diluted Earnings Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 25, 2020	Apr. 27, 2019
Basic earnings per unit
Net (loss) income	$ (32,418)	$ 14,279
Weighted-average number of common shares (in shares)	31,603,498	31,451,809
Basic earnings per common share (in dollars per share)	$ (1.03)	$ 0.45
Diluted earnings per unit
Weighted-average number of common shares (in shares)	31,603,498	31,451,809
Potential common stock arising from stock options, and unvested restricted share units (in shares)	0	334,650
Total shares-diluted (in shares)	31,603,498	31,786,459
Diluted earnings per common share (in dollars per share)	$ (1.03)	$ 0.45
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	6,656,443	10,277,839
Potential shares of common stock issuable on exercise of convertible senior notes	0	0
Stock-based awards
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	608,279	266,371
Convertible senior notes
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	3,024,082	5,005,734
Warrants
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	3,024,082	5,005,734