Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Common Stock [Member] Class A [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance at Jan. 31, 2015	$ 0	$ 48	$ (29)	$ 393,078	$ 23,738	$ 416,835
Beginning balance (in shares) at Jan. 31, 2015	0	48,203,000	(3,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 0	$ 0	$ 0	5,035	0	5,035
Proceeds from stock options exercised	$ 1	$ 0	$ 0	2,270	0	2,271
Proceeds from stock options exercised (in shares)	335,000	5,000	0
Excess tax benefit related to exercises of stock options	$ 0	$ 0	$ 0	1,068	0	1,068
Conversion of Class A and Class B common stock to a single class of common stock		$ (48)
Conversion of Class A and Class B common stock to a single class of common stock (in shares)		(48,208,000)
Conversion of Class A and Class B common stock to a single class of common stock	$ 48		$ 0	0	0	0
Conversion of Class A and Class B common stock to a single class of common stock (in shares)	48,208,000		0
Proceeds from issuance of common stock, net of expenses	$ 10	$ 0	$ 0	149,796	0	149,806
Proceeds from issuance of common stock, net of expenses (in shares)	10,264,000	0	0
Dividend paid	$ 0	$ 0	$ 0	(14,932)	(33,916)	(48,848)
Purchase of treasury stock	$ 0	$ 0	$ (57)	0	0	$ (57)
Purchase of treasury stock (in shares)	0	0	(6,000)			(5,570)
Net income	$ 0	$ 0	$ 0	0	35,839	$ 35,839
Ending balance at Jan. 30, 2016	$ 59	$ 0	$ (86)	536,315	25,661	561,949
Ending balance (in shares) at Jan. 30, 2016	58,807,000	0	(9,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 0	$ 0	$ 0	6,685	0	6,685
Proceeds from stock options exercised	$ 2	$ 0	$ 0	13,302	0	13,304
Proceeds from stock options exercised (in shares)	1,949,000	0	0
Excess tax benefit related to exercises of stock options	$ 0	$ 0	$ 0	9,559	0	$ 9,559
Purchase of treasury stock (in shares)						0
Net income	0	0	0	0	59,764	$ 59,764
Ending balance at Jan. 28, 2017	$ 61	$ 0	$ (86)	565,861	85,425	651,261
Ending balance (in shares) at Jan. 28, 2017	60,756,000	0	(9,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 0	$ 0	$ 0	7,413	0	7,413
Proceeds from stock options exercised	$ 1	$ 0	$ 0	10,412	0	$ 10,413
Proceeds from stock options exercised (in shares)	1,231,000	0	0
Purchase of treasury stock (in shares)						0
Vesting of restricted stock	$ 0	$ 0	$ 0	0	0	$ 0
Vesting of restricted stock (in shares)	27,000	0	0
Common shares withheld for taxes	$ 0	$ 0	$ 0	(219)	0	(219)
Common shares withheld for taxes (in shares)	(7,000)	0	0
Net income	$ 0	$ 0	$ 0	0	127,594	127,594
Ending balance at Feb. 03, 2018	$ 62	$ 0	$ (86)	$ 583,467	$ 213,019	$ 796,462
Ending balance (in shares) at Feb. 03, 2018	62,007,000	0	(9,000)