Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Apr. 28, 2012	Apr. 30, 2011	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
Net income	$ 31,723	$ 30,521	$ 61,668	$ 64,834	$ 58,851
Unrealized losses on available-for-sale securities, net of deferred income tax benefit			115	(660)	258
Class A Common Stock
Balance	914	925	914	925	928
Net income			0	0	0
Unrealized losses on available-for-sale securities, net of deferred income tax benefit			0	0	0
Dividends			0	0	0
Class A common stock sold through employee stock purchase plan			1	1	1
Class A common stock sold through stock option plans			0	0	1
Class A common stock issued through restricted stock grant plans			3	3	4
Windfall tax benefit from equity compensation plans			0	0
Retirement of treasury sharess			0	(15)	(9)
Convertible Class B Common Stock
Balance	58	58	58	58	58
Net income			0	0	0
Unrealized losses on available-for-sale securities, net of deferred income tax benefit			0	0	0
Dividends			0	0	0
Class A common stock sold through employee stock purchase plan			0	0	0
Class A common stock sold through stock option plans			0	0	0
Class A common stock issued through restricted stock grant plans			0	0	0
Windfall tax benefit from equity compensation plans			0	0	0
Retirement of treasury sharess			0	0	0
Common Stock Including Additional Paid in Capital
Balance	72,030	68,537	72,030	68,537	64,706
Net income			0	0	0
Unrealized losses on available-for-sale securities, net of deferred income tax benefit			0	0	0
Dividends			0	0	0
Class A common stock sold through employee stock purchase plan			849	571	512
Class A common stock sold through stock option plans			562	290	739
Class A common stock issued through restricted stock grant plans			2,644	2,459	2,299
Windfall tax benefit from equity compensation plans			509	173	281
Retirement of treasury sharess			0	0	0
Retained Earnings
Balance	292,741	264,217	292,741	264,217	232,423
Net income			61,668	64,834	58,851
Unrealized losses on available-for-sale securities, net of deferred income tax benefit			0	0
Dividends			(87,222)	(25,715)	(21,216)
Class A common stock sold through employee stock purchase plan			0	0	0
Class A common stock sold through stock option plans			0	0	0
Class A common stock issued through restricted stock grant plans			23	12	13
Windfall tax benefit from equity compensation plans			0		0
Retirement of treasury sharess			(367)	(10,607)	(5,854)
Accumulated Other Comprehensive Income (Loss)
Balance	936	276	936	276	534
Net income			0	0	0
Unrealized losses on available-for-sale securities, net of deferred income tax benefit			(115)	660	(258)
Dividends			0	0	0
Class A common stock sold through employee stock purchase plan			0	0	0
Class A common stock sold through stock option plans			0	0	0
Class A common stock issued through restricted stock grant plans			0	0	0
Windfall tax benefit from equity compensation plans			0	0	0
Retirement of treasury sharess			0	0	0
us-gaap_TreasuryStockMember
Class A common stock issued through restricted stock grant plans				$ 0