Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Cash flows from operating activities:
Cash received from customers	$ 48,892,924	$ 47,836,136	$ 42,981,601
Cash paid to vendors and employees	(48,118,538)	(47,263,258)	(41,668,923)
Interest paid, net	(87,886)	(97,293)	(86,544)
Income taxes paid	(93,410)	(95,450)	(131,632)
Net cash provided by operating activities	593,090	380,135	1,094,502
Cash flows from investing activities:
Proceeds from sale of business, net of cash divested	0	8,985	0
Acquisition of businesses, net of cash acquired	(209,923)	(124,223)	(2,249,849)
Expenditures for property and equipment	(48,352)	(40,995)	(192,235)
Software and software development costs	(36,470)	(20,419)	(39,702)
Other	4,491	4,943	2,567
Net cash used in investing activities	(290,254)	(171,709)	(2,479,219)
Cash flows from financing activities:
Borrowings on long-term debt	300,000	0	1,008,148
Principal payments on long-term debt	(345,177)	(208,591)	(861,394)
Cash paid for debt issuance costs	(4,341)	0	(6,348)
Net repayments on revolving credit loans	(9,005)	(11,288)	(16,028)
Payments for employee withholdings on equity awards	(9,428)	(7,102)	(6,027)
Proceeds from the reissuance of treasury stock	1,660	1,771	1,543
Acquisition of noncontrolling interest	(7,553)	0	0
Repurchases of common stock	(170,191)	(107,025)	0
Other	529	0	0
Net cash (used in) provided by financing activities	(243,506)	(332,235)	119,894
Effect of Exchange Rate on Cash and Cash Equivalents	(17,087)	(32,696)	94,860
Net increase (decrease) in cash and cash equivalents	42,243	(156,505)	(1,169,963)
Cash and cash equivalents at beginning of year	799,123	955,628	2,125,591
Cash and cash equivalents at end of year	841,366	799,123	955,628
Reconciliation of net income to net cash provided by operating activities:
Net income	374,500	340,580	116,641
Adjustments to reconcile net income to net cash provided by operating activities:
Goodwill Impairment	0	47,434	0
Gain on disposal of subsidiary	(1,390)	(6,746)	0
Depreciation and amortization	153,099	158,997	150,046
Provision for losses on accounts receivable	21,081	9,903	19,788
Stock-based compensation expense	32,187	31,513	29,381
Accretion of debt discount and debt issuance costs	4,042	3,841	5,698
Deferred income taxes	19,187	(12,482)	(4,261)
Changes in operating assets and liabilities, net of acquisitions and disposition:
Accounts receivable	159,569	(512,385)	(632,809)
Inventories	213,344	(480,001)	(466,445)
Prepaid expenses and other assets	66,777	13,581	(9,120)
Accounts payable	(406,839)	852,369	1,704,305
Accrued expenses and other liabilities	(42,467)	(66,469)	181,278
Total adjustments	218,590	39,555	977,861
Net cash provided by operating activities	593,090	380,135	1,094,502
Issuance of stock to acquire business	$ 0	$ 0	$ 247,232