Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Class A [Member]	Common Class B [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at Jan. 31, 2009	$ 261,813	$ 1,210	$ 58	$ 61,608	$ 354,333	$ 413	$ (155,809)
Statement Of Stockholders Equity [Line Items]
Change in Accounting Principle	8,117				8,117
Net income	44,985				44,985
Unrealized losses on available-for-sale securities, net of deferred income tax benefit	121					121
Dividends	(19,481)				(19,481)
Class A common stock sold through employee stock purchase plan	484	1		483
Class A common stock sold through stock option plans	537	2		535
Class A common stock issued through restricted stock grant plans	1,921	4		1,879	38
Windfall tax benefit from equity compensation plans	201			201
Repurchase of treasury shares	(49)						(49)
Retirement of treasury sharess	0	(289)			(155,569)		155,858
Balance at Jan. 30, 2010	298,649	928	58	64,706	232,423	534
Statement Of Stockholders Equity [Line Items]
Net income	58,851				58,851
Unrealized losses on available-for-sale securities, net of deferred income tax benefit	(258)					(258)
Dividends	21,216				21,216
Class A common stock sold through employee stock purchase plan	(513)	(1)		(512)
Class A common stock sold through stock option plans	(740)	(1)		(739)
Class A common stock issued through restricted stock grant plans	(2,316)	(4)		(2,299)	(13)
Windfall tax benefit from equity compensation plans	(281)			(281)
Repurchase of treasury shares	5,863	9			5,854
Balance at Jan. 29, 2011	334,013	925	58	68,537	264,217	276
Statement Of Stockholders Equity [Line Items]
Net income	64,834				64,834
Unrealized losses on available-for-sale securities, net of deferred income tax benefit	660					660
Dividends	(25,715)				(25,715)
Class A common stock sold through employee stock purchase plan	572	1		571
Class A common stock sold through stock option plans	290			290
Class A common stock issued through restricted stock grant plans	2,474	3		2,459	12
Windfall tax benefit from equity compensation plans	173			173
Repurchase of treasury shares	(10,622)	(15)			(10,607)
Balance at Jan. 28, 2012	$ 366,679	$ 914	$ 58	$ 72,030	$ 292,741	$ 936