Interim Financial Information (Unaudited) (Condensed Income Statement) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																12 Months Ended
		Jan. 31, 2020		Oct. 31, 2019		Jul. 31, 2019		Apr. 30, 2019		Jan. 31, 2019		Oct. 31, 2018		Jul. 31, 2018		Apr. 30, 2018		Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Condensed Financial Statements, Captions
Net sales		$ 10,380,809		$ 9,118,944		$ 9,092,244		$ 8,406,424		$ 10,464,501		$ 9,340,029		$ 8,886,101		$ 8,548,319		$ 36,998,421	$ 37,238,950		$ 33,597,841
Gross profit		666,231		560,387		561,650		509,379		649,148		556,604		527,030		523,117		2,297,647	2,255,899		2,115,621
Operating income		218,070	[1]	141,888	[1]	124,747	[1]	97,624	[1]	166,053	[2],[3]	146,888	[2],[4],[5]	110,365	[2],[4]	70,496	[2],[4]	582,329	493,802		410,079
Net income		149,080		90,770		79,250		55,400		116,799	[6]	114,216	[6]	75,866		33,699		374,500	340,580		116,641
Gain (Loss) Related to Litigation Settlement												7,200		5,200		3,000		633	15,406		41,343
Business Combination, Acquisition Related Costs		$ 10,000		$ 4,600		$ 5,200		$ 6,200		21,100		20,300		$ 13,300		$ 33,200		26,030	87,920		136,272
Gain on disposal of subsidiary																		1,390	6,746		0
USTaxActImpactOnUSFederalTaxRate																					95,400
Reversal of valuation allowance																		5,200	37,800
US Tax Act Impact - Transition Tax										25,200		24,000							49,200		(101,100)
Accounts Receivable, Allowance for Credit Loss, Recovery												$ 25,000
Goodwill Impairment										$ 47,400								$ 0	$ 47,434		$ 0
Earnings per share:
Basic		$ 4.19		$ 2.54		$ 2.17		$ 1.50		$ 3.13		$ 2.98		$ 1.97		$ 0.88		$ 10.35	$ 8.94		$ 3.07
Diluted		$ 4.15		$ 2.52		$ 2.16		$ 1.49		$ 3.11		$ 2.96		$ 1.97		$ 0.87		$ 10.27	$ 8.89		$ 3.05
Asia Pacific [Member]
Condensed Financial Statements, Captions
Net sales																		$ 1,266,358	$ 1,171,790		$ 1,030,703
Operating income																		8,785	(36,697)	[7]	17,499
Goodwill Impairment																			47,400
Europe
Condensed Financial Statements, Captions
Net sales																		19,132,040	20,026,057		18,147,917
Operating income	[8]																	272,498	195,375		173,611
Business Combination, Acquisition Related Costs																		8,400	57,700		$ 56,200
Gain on disposal of subsidiary																		$ 1,400	$ 6,700

[1] During the first, second, third and fourth quarters of fiscal 2020, the Company recorded $6.2 million, $5.2 million, $4.6 million and $10.0 million of acquisition, integration and restructuring expenses, respectively (see Note 6 – Acquisition, Integration and Restructuring Expenses for further discussion).

[2] During the first, second, third and fourth quarters of fiscal 2019, the Company recorded $33.2 million, $13.3 million, $20.3 million and $21.1 million of acquisition, integration and restructuring expenses, respectively.

[3] During the fourth quarter of fiscal 2019, the Company recorded goodwill impairment expense of $47.4 million (see Note 4 – Goodwill and Intangible Assets for further discussion).

[4] During the first, second and third quarters of fiscal 2019, the Company recorded a gain of $3.0 million, $5.2 million and $7.2 million, respectively, in legal settlements and other, net.

[5] During the third quarter of fiscal 2019, the Company included a $25 million benefit in operating income related to the collection of an accounts receivable balance previously considered uncollectible.

[6] The Company decreased its estimate of the one-time transition tax related to the enactment of U.S. Tax Reform by $24.0 million and $25.2 million, respectively, in the third and fourth quarters of fiscal 2019 (see Note 9 – Income Taxes for further discussion).

[7] Operating income in Asia-Pacific for the fiscal year ended January 31, 2019 includes goodwill impairment expense of $47.4 million (see Note 4 – Goodwill and Intangible Assets for further discussion).

[8] Operating income in Europe for the fiscal years ended January 31, 2020, 2019 and 2018 includes acquisition, integration and restructuring expenses of $8.4 million, $57.7 million and $56.2 million, respectively.