CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Income Statement [Abstract]
Net sales	$ 1,075.9	$ 959.7	$ 2,109.1	$ 1,859.3
Cost of sales	387.1	360.1	769.4	700.6
Gross profit	688.8	599.6	1,339.7	1,158.7
Selling, general and administrative expenses	497.6	414.9	944.2	824.3
Earnings from operations	191.2	184.7	395.5	334.4
Interest expense and financing costs	9.7	10.4	19.6	21.1
Other (income) expense, net	(0.5)	1.8	3.4	4.6
Earnings from operations before income taxes	182.0	172.5	372.5	308.7
Provision for income taxes	37.3	57.5	85.5	100.8
Net earnings	$ 144.7	$ 115.0	$ 287.0	$ 207.9
Net earnings per share:
Basic (in dollars per share)	$ 1.17	$ 0.92	$ 2.32	$ 1.67
Diluted (in dollars per share)	$ 1.17	$ 0.92	$ 2.31	$ 1.66
Weighted-average number of common shares:
Basic (in shares)	123.2	124.5	123.8	124.6
Diluted (in shares)	124.0	125.1	124.5	125.2