CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Income Statement [Abstract]
Net sales	$ 992,930,000	$ 925,884,000	$ 2,005,062,000	$ 1,821,368,000
Cost of sales	397,767,000	393,755,000	820,373,000	786,015,000
Gross profit	595,163,000	532,129,000	1,184,689,000	1,035,353,000
Selling, general and administrative expenses	386,642,000	355,243,000	766,375,000	717,309,000
Earnings from operations	208,521,000	176,886,000	418,314,000	318,044,000
Interest and other expenses, net	16,151,000	14,694,000	32,427,000	27,406,000
Earnings from operations before income taxes	192,370,000	162,192,000	385,887,000	290,638,000
Provision for income taxes	68,250,000	55,411,000	136,158,000	100,280,000
Net earnings	$ 124,120,000	$ 106,781,000	$ 249,729,000	$ 190,358,000
Net earnings per share:
Basic	$ 0.96	$ 0.84	$ 1.93	$ 1.49
Diluted	$ 0.96	$ 0.83	$ 1.92	$ 1.48
Weighted-average number of common shares:
Basic	129,252,000	127,826,000	129,093,000	127,572,000
Diluted	129,908,000	128,771,000	129,851,000	128,606,000