Condensed Consolidated Statements of Earnings (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Condensed Consolidated Statements of Earnings [Abstract]
Net sales	$ 872,712	$ 668,760	$ 1,633,730	$ 1,302,346
Cost of sales	358,015	282,008	675,340	549,616
Gross profit	514,697	386,752	958,390	752,730
Selling, general and administrative expenses	374,157	273,146	681,884	533,707
Earnings from operations	140,540	113,606	276,506	219,023
Interest and other expenses, net	9,619	11,121	19,766	23,259
Earnings from operations before income taxes	130,921	102,485	256,740	195,764
Provision for income taxes	40,878	34,810	85,634	63,664
Net earnings	$ 90,043	$ 67,675	$ 171,106	$ 132,100
Earnings per share:
Basic	$ 0.70	$ 0.53	$ 1.34	$ 1.04
Diluted	$ 0.69	$ 0.53	$ 1.32	$ 1.03
Reconciliation of numerators and denominators for basic and diluted EPS computations
Basic	128,030	126,897	127,816	126,798
Diluted	129,794	128,385	129,587	128,464