Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Cash received from customers	$ 19,826,856	$ 13,910,326
Cash paid to vendors and employees	(19,357,817)	(13,669,609)
Interest paid, net	(32,425)	(10,065)
Income taxes paid	(66,066)	(45,749)
Net cash provided by operating activities	370,548	184,903
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(2,249,344)	(2,685)
Expenditures for property and equipment	(12,613)	(13,598)
Software and software development costs	(29,200)	(8,737)
Net cash used in investing activities	(2,291,157)	(25,020)
Cash flows from financing activities:
Borrowings on long-term debt	1,008,148	0
Principal payments on long-term debt	(210,946)	0
Cash paid for debt issuance costs	(5,121)	0
Net repayments on revolving credit loans	(18,786)	(4,783)
Payments for employee tax withholdings on equity awards	(5,686)	(4,218)
Proceeds from the reissuance of treasury stock	694	317
Net cash provided by (used in) financing activities	768,303	(8,684)
Effect of exchange rate changes on cash and cash equivalents	59,982	14,679
Net (decrease) increase in cash and cash equivalents	(1,092,324)	165,878
Cash and cash equivalents at beginning of year	2,125,591	531,169
Cash and cash equivalents at end of period	1,033,267	697,047
Reconciliation of net income to net cash provided by operating activities:
Net income	78,113	79,767
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,573	28,095
Provision for losses on accounts receivable	7,437	2,098
Stock-based compensation expense	12,892	7,470
Accretion of debt discount and debt issuance costs	1,174	417
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	96,342	312,611
Inventories	(232,297)	(6,252)
Prepaid expenses and other assets	(11,364)	61,238
Accounts payable	420,471	(211,411)
Accrued expenses and other liabilities	(72,793)	(89,130)
Total adjustments	292,435	105,136
Net cash provided by operating activities	370,548	184,903
Supplemental schedule of non-cash investing activities:
Issuance of stock to acquire business	$ 247,232	$ 0