Consolidated Statement Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Income Statement [Abstract]
Net sales	$ 9,092,244	$ 8,886,101	$ 17,498,668	$ 17,434,420
Cost of products sold	8,530,594	8,359,071	16,427,639	16,384,273
Gross profit	561,650	527,030	1,071,029	1,050,147
Selling, general and administrative expenses	431,694	415,319	837,510	837,680
Acquisition, integration and restructuring expenses	5,209	13,297	11,430	46,522
Legal settlements and other, net	0	(5,234)	(282)	(8,199)
Gain on disposal of subsidiary	0	(6,717)	0	(6,717)
Operating expenses	436,903	416,665	848,658	869,286
Operating income	124,747	110,365	222,371	180,861
Interest expense	20,986	28,053	47,243	53,975
Other expense, net	2,896	901	2,203	2,818
Income before income taxes	100,865	81,411	172,925	124,068
Provision for income taxes	21,615	5,545	38,275	14,503
Net income	$ 79,250	$ 75,866	$ 134,650	$ 109,565
Earnings per share:
Basic	$ 2.17	$ 1.97	$ 3.67	$ 2.86
Diluted	$ 2.16	$ 1.97	$ 3.64	$ 2.84
Weighted average common shares outstanding:
Basic	36,476	38,428	36,739	38,356
Diluted	36,661	38,566	36,964	38,565