CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Net sales	$ 1,128,403	$ 1,072,982	$ 2,405,847	$ 2,309,423
Cost of goods sold	729,384	690,882	1,538,995	1,461,252
Gross profit	399,019	382,100	866,852	848,171
Selling, general and administrative expenses	246,580	232,052	644,887	632,983
Depreciation and amortization	9,701	10,033	28,963	28,868
Gain on lease terminations	(124)		(2,346)
Operating profit	142,862	140,015	195,348	186,320
Other income (loss)	677	176	(722)	(303)
Interest and financing charges, net	(12,518)	(12,323)	(33,623)	(32,153)
Income before income taxes	131,021	127,868	161,003	153,864
Income tax expense	35,634	33,843	42,454	39,877
Net income	$ 95,387	$ 94,025	$ 118,549	$ 113,987
Basic:
Net income per common share (in dollars per share)	$ 2.00	$ 1.91	$ 2.45	$ 2.32
Weighted average number of shares outstanding (in shares)	47,768	49,231	48,333	49,176
Diluted:
Net income per common share (in dollars per share)	$ 1.97	$ 1.86	$ 2.42	$ 2.26
Weighted average number of shares outstanding (in shares)	48,356	50,494	49,056	50,345
Net income	$ 95,387	$ 94,025	$ 118,549	$ 113,987
Other comprehensive income:
Foreign currency translation adjustments	(6,212)	(1,979)	(7,866)	(10,044)
Other comprehensive loss	(6,212)	(1,979)	(7,866)	(10,044)
Comprehensive income	$ 89,175	$ 92,046	$ 110,683	$ 103,943