Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Cash flows from operating activities:
Cash received from customers	$ 13,910,326	$ 13,354,829
Cash paid to vendors and employees	(13,669,609)	(13,007,986)
Interest paid, net	(10,065)	(9,736)
Income taxes paid	(45,749)	(29,345)
Net cash provided by operating activities	184,903	307,762
Cash flows from investing activities:
Expenditures for property and equipment	(13,598)	(8,816)
Software and software development costs	(8,737)	(6,180)
Acquisition of businesses, net of cash acquired	(2,685)	(27,848)
Proceeds from sale of subsidiaries	0	18,747
Net cash used in investing activities	(25,020)	(24,097)
Cash flows from financing activities:
Payments for employee tax withholdings on equity awards	(4,218)	(4,456)
Net (repayments) borrowings on revolving credit loans	(4,783)	5,857
Proceeds from the reissuance of treasury stock	317	229
Cash paid for purchase of treasury stock	0	(110,092)
Principal payments on long-term debt	0	(238)
Acquisition earn-out payment	0	(2,736)
Net cash used in financing activities	(8,684)	(111,436)
Effect of exchange rate changes on cash and cash equivalents	14,679	(5,955)
Net increase in cash and cash equivalents	165,878	166,274
Cash and cash equivalents at beginning of year	531,169	542,995
Cash and cash equivalents at end of period	697,047	709,269
Reconciliation of net income to net cash provided by operating activities:
Net income	79,767	127,689
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of subsidiaries	0	517
Depreciation and amortization	28,095	28,171
Provision for losses on accounts receivable	2,098	2,050
Stock-based compensation expense	7,470	7,778
Accretion of debt discount and debt issuance costs on Senior Notes	417	418
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	312,611	85,962
Inventories	(6,252)	(38,238)
Prepaid expenses and other assets	61,238	(34,129)
Accounts payable	(211,411)	134,777
Accrued expenses and other liabilities	(89,130)	(7,233)
Total adjustments	105,136	180,073
Net cash provided by operating activities	$ 184,903	$ 307,762