Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period Of Adoption	Unrestricted stock [Member]	Common Stock [Member]	Common Stock [Member] Unrestricted stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Unrestricted stock [Member]	Accumulated deficit [Member]	Accumulated deficit [Member] Cumulative Effect, Period Of Adoption
Balance at Feb. 03, 2018	$ 458,558			$ 554		$ 346,300		$ 111,704
Balance (ASU 2014-09) at Feb. 03, 2018		$ 486							$ 486
Balance, common stock, shares at Feb. 03, 2018				55,438,089
Share-based compensation expense	11,807					11,807
Issuance of unrestricted stock awards			$ 180				$ 180
Issuance of unrestricted stock awards (in shares)					2,056
Exercise of options to purchase common stock	4,027			$ 1		4,026
Exercise of options and warrants to purchase common stock (in shares)				145,157
Vesting of restricted stock units and performance-based restricted stock units	3			$ 3
Vesting of restricted stock units and performance-based restricted stock units (in shares)				(305,201)
Common Shares Withheld	(7,990)			$ (1)		(7,989)
Common shares withheld for taxes (in shares)				113,058
Repurchase and retirement of common stock	1,987					1,987
Repurchase and retirement of stock (in shares)				(21,810)
Issuance of common stock to employees under employee stock purchase plan	365					365
Issuance of common stock to employees under employee stock purchase plan (in shares)				3,413
Net income	149,645							149,645
Balance at Feb. 02, 2019	615,094			$ 557		352,702		261,835
Balance, common stock, shares at Feb. 02, 2019				55,759,048
Issuance of unrestricted stock awards	12,136		198			12,136	198
Issuance of unrestricted stock awards (in shares)					1,634
Exercise of options to purchase common stock	4,109			$ 2		4,107
Exercise of options and warrants to purchase common stock (in shares)				141,582
Vesting of restricted stock units and performance-based restricted stock units	2			$ 2
Vesting of restricted stock units and performance-based restricted stock units (in shares)				(227,020)
Common Shares Withheld	(10,367)			$ (1)		(10,366)
Common shares withheld for taxes (in shares)				83,121
Repurchase and retirement of common stock	36,885			$ (3)		36,882
Repurchase and retirement of stock (in shares)				(337,552)
Issuance of common stock to employees under employee stock purchase plan	435					435
Issuance of common stock to employees under employee stock purchase plan (in shares)				3,456
Net income	175,056							175,056
Balance at Feb. 01, 2020	$ 759,778			$ 557		322,330		436,891
Balance, common stock, shares at Feb. 01, 2020	55,712,067			55,712,067
Issuance of unrestricted stock awards	$ 9,294		$ 208			9,294	$ 208
Exercise of options to purchase common stock	5,346			$ 2		5,344
Exercise of options and warrants to purchase common stock (in shares)				176,846
Vesting of restricted stock units and performance-based restricted stock units	2			$ 2
Vesting of restricted stock units and performance-based restricted stock units (in shares)				(230,002)	(1,518)
Common Shares Withheld	(3,917)			$ (1)		(3,916)
Common shares withheld for taxes (in shares)				51,734
Repurchase and retirement of common stock	12,663			$ (1)		12,662
Repurchase and retirement of stock (in shares)				(137,023)
Issuance of common stock to employees under employee stock purchase plan	477					477
Issuance of common stock to employees under employee stock purchase plan (in shares)				3,561
Net income	123,361
Balance at Jan. 30, 2021	$ 881,886			$ 559		$ 321,075		$ 560,252
Balance, common stock, shares at Jan. 30, 2021	55,935,237			55,935,237