Condensed Consolidated Statements of Earnings (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Condensed Consolidated Statements of Earnings [Abstract]
Net sales	$ 886,569	$ 872,712	$ 1,705,739	$ 1,633,730
Cost of sales	387,407	358,015	737,559	675,340
Gross profit	499,162	514,697	968,180	958,390
Selling, general and administrative expenses	344,582	374,157	678,615	681,884
Earnings from operations	154,580	140,540	289,565	276,506
Interest and other expenses, net	14,250	9,619	24,804	19,766
Earnings from operations before income taxes	140,330	130,921	264,761	256,740
Provision for income taxes	48,529	40,878	91,426	85,634
Net earnings	$ 91,801	$ 90,043	$ 173,335	$ 171,106
Earnings per share:
Basic	$ 0.72	$ 0.70	$ 1.37	$ 1.34
Diluted	$ 0.72	$ 0.69	$ 1.36	$ 1.32
Weighted-average number of common shares:
Basic	126,631	128,030	126,677	127,816
Diluted	127,663	129,794	127,920	129,587