CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Income Statement [Abstract]
Net sales	$ 925,884	$ 886,569	$ 1,821,368	$ 1,705,739
Cost of sales	393,755	387,407	786,015	737,559
Gross profit	532,129	499,162	1,035,353	968,180
Selling, general and administrative expenses	355,243	344,582	717,309	678,615
Earnings from operations	176,886	154,580	318,044	289,565
Interest and other expenses, net	14,694	14,250	27,406	24,804
Earnings from operations before income taxes	162,192	140,330	290,638	264,761
Provision for income taxes	55,411	48,529	100,280	91,426
Net earnings	$ 106,781	$ 91,801	$ 190,358	$ 173,335
Net earnings per share:
Basic	$ 0.84	$ 0.72	$ 1.49	$ 1.37
Diluted	$ 0.83	$ 0.72	$ 1.48	$ 1.36
Weighted-average number of common shares:
Basic	127,826	126,631	127,572	126,677
Diluted	128,771	127,663	128,606	127,920