CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Income Statement [Abstract]
Net sales	$ 911,478	$ 852,741	$ 2,732,846	$ 2,558,480
Cost of sales	391,997	388,452	1,178,012	1,126,011
Gross profit	519,481	464,289	1,554,834	1,432,469
Selling, general and administrative expenses	365,863	346,994	1,083,172	1,025,609
Earnings from operations	153,618	117,295	471,662	406,860
Interest and other expenses, net	13,922	14,783	41,328	39,587
Earnings from operations before income taxes	139,696	102,512	430,334	367,273
Provision for income taxes	45,086	39,333	145,366	130,759
Net earnings	$ 94,610	$ 63,179	$ 284,968	$ 236,514
Net earnings per share:
Basic	$ 0.74	$ 0.50	$ 2.23	$ 1.87
Diluted	$ 0.73	$ 0.49	$ 2.21	$ 1.85
Weighted-average number of common shares:
Basic	128,004	126,737	127,716	126,697
Diluted	128,974	127,902	128,729	127,914