Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock Previously reported	Common Stock As adjusted	Common Stock	Additional Paid-in Capital Previously reported	Additional Paid-in Capital As adjusted	Additional Paid-in Capital	Retained earnings Previously reported	Retained earnings As adjusted	Retained earnings	Previously reported	As adjusted	Total
Increase (Decrease) in Stockholders' Equity
Adoption of ASU No. 2016-02, Leases | ASU 2016-02									$ 98,594			$ 98,594
Balance - Stockholder's Equity at Jan. 26, 2019	$ 636	$ 636		$ 643,677	$ 643,677		$ 66,773	$ 165,367		$ 711,086	$ 809,680
Balance - Stockholder's Equity (in shares) at Jan. 26, 2019	63,609,684	63,609,684
Increase (Decrease) in Stockholders' Equity
Stock-based compensation						$ 1,848						1,848
Exercise of stock options and other awards			$ 4			4,761						4,765
Exercise of stock options and other awards (in shares)			349,722
Net income (loss)									13,883			13,883
Balance - Stockholder's Equity at Apr. 27, 2019			$ 640			650,286			179,250			830,176
Balance - Stockholder's Equity (in shares) at Apr. 27, 2019			63,959,406
Balance - Stockholder's Equity at Jan. 25, 2020			$ 641			657,038			(49,068)			608,611
Balance - Stockholder's Equity (in shares) at Jan. 25, 2020			64,106,061
Increase (Decrease) in Stockholders' Equity
Stock-based compensation						2,063						2,063
Exercise of stock options and other awards			$ 1			(17)						(16)
Exercise of stock options and other awards (in shares)			79,690
Net income (loss)									(358,942)			(358,942)
Balance - Stockholder's Equity at Apr. 25, 2020			$ 642			$ 659,084			$ (408,010)			$ 251,716
Balance - Stockholder's Equity (in shares) at Apr. 25, 2020			64,185,751