Consolidated Statement Of 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	$ 9,118,944	$ 9,340,029	$ 26,617,612	$ 26,774,449
Cost of products sold	8,558,557	8,783,425	24,986,196	25,167,698
Gross profit	560,387	556,604	1,631,416	1,606,751
Selling, general and administrative expenses	415,242	396,675	1,252,752	1,234,355
Acquisition, integration and restructuring expenses	4,647	20,277	16,077	66,799
Legal settlements and other, net	0	(7,207)	(282)	(15,406)
Gain on disposal of subsidiary	(1,390)	(29)	(1,390)	(6,746)
Operating expenses	418,499	409,716	1,267,157	1,279,002
Operating income	141,888	146,888	364,259	327,749
Interest expense	21,033	25,405	68,276	79,380
Other expense, net	4,348	4,961	6,551	7,779
Income before income taxes	116,507	116,522	289,432	240,590
Provision for income taxes	25,737	2,306	64,012	16,809
Net income	$ 90,770	$ 114,216	$ 225,420	$ 223,781
Earnings per share:
Basic	$ 2.54	$ 2.98	$ 6.19	$ 5.83
Diluted	$ 2.52	$ 2.96	$ 6.15	$ 5.80
Weighted average common shares outstanding:
Basic	35,720	38,358	36,395	38,357
Diluted	35,968	38,526	36,630	38,559