Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Cash flows from operating activities:
Cash received from customers	$ 34,190,821	$ 30,645,389
Cash paid to vendors and employees	(33,891,567)	(30,030,519)
Interest paid, net	(82,829)	(73,180)
Income taxes paid	(67,107)	(100,615)
Net cash provided by operating activities	149,318	441,075
Cash flows from investing activities:
Proceeds from sale of business, net of cash divested	8,985	0
Acquisition of businesses, net of cash acquired	(124,223)	(2,249,642)
Expenditures for property and equipment	(24,830)	(179,114)
Software and software development costs	(15,323)	(34,865)
Other	1,105	(662)
Net cash used in investing activities	(154,286)	(2,464,283)
Cash flows from financing activities:
Borrowings on long-term debt	0	1,008,148
Principal payments on long-term debt	(207,854)	(565,952)
Cash paid for debt issuance costs	0	(5,871)
Net repayments on revolving credit loans	(9,274)	(24,851)
Payments for employee tax withholdings on equity awards	(6,988)	(5,915)
Proceeds from the reissuance of treasury stock	1,322	1,079
Payments for Repurchase of Common Stock	(43,798)	0
Net cash (used in) provided by financing activities	(266,592)	406,638
Effect of exchange rate changes on cash and cash equivalents	(37,589)	53,624
Net decrease in cash and cash equivalents	(309,149)	(1,562,946)
Cash and cash equivalents at beginning of year	955,628	2,125,591
Cash and cash equivalents at end of period	646,479	562,645
Reconciliation of net income to net cash provided by operating activities:
Net income	223,781	115,381
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on disposal of subsidiary	6,746	0
Depreciation and amortization	119,641	112,907
Provision for losses on accounts receivable	11,545	13,191
Stock-based compensation expense	23,694	21,217
Accretion of debt discount and debt issuance costs	1,134	1,692
Deferred Income Tax Expense (Benefit)	(11,567)	1,312
Changes in operating assets and liabilities, net of acquisitions and disposition:
Accounts receivable	(309,390)	190,070
Inventories	(397,692)	(416,832)
Prepaid expenses and other assets	(1,871)	(3,500)
Accounts payable	474,214	470,569
Accrued expenses and other liabilities	22,575	(64,932)
Total adjustments	(74,463)	325,694
Net cash provided by operating activities	149,318	441,075
Supplemental schedule of non-cash investing activities:
Issuance of stock to acquire business	$ 0	$ 247,232