Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Cash flows from operating activities:
Cash received from customers	$ 11,514,374	$ 9,501,659
Cash paid to vendors and employees	(12,038,399)	(9,237,349)
Interest paid, net	(33,763)	(19,456)
Income taxes paid	(8,830)	(19,496)
Net cash (used in) provided by operating activities	(566,618)	225,358
Cash flows from investing activities:
Acquisition of business, net of cash acquired	0	(2,249,959)
Expenditures for property and equipment	(4,894)	(4,373)
Software and software development costs	(3,561)	(26,073)
Other	267	1,000
Net cash used in investing activities	(8,722)	(2,281,405)
Cash flows from financing activities:
Borrowings on long-term debt	0	1,008,148
Principal payments on long-term debt	(2,899)	(200,000)
Cash paid for debt issuance costs	0	(5,121)
Net repayments on revolving credit loans	(13,291)	(7,589)
Payments for employee tax withholdings on equity awards	(6,255)	(5,500)
Proceeds from the reissuance of treasury stock	442	389
Net cash (used in) provided by financing activities	(22,003)	790,327
Effect of exchange rate changes on cash and cash equivalents	(12,708)	1,670
Net decrease in cash and cash equivalents	(610,051)	(1,264,050)
Cash and cash equivalents at beginning of year	955,628	2,125,591
Cash and cash equivalents at end of period	345,577	861,541
Reconciliation of net income to net cash provided by operating activities:
Net income	33,699	30,654
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	40,481	31,683
Provision for losses on accounts receivable	924	3,910
Stock-based compensation expense	7,587	4,918
Accretion of debt discount and debt issuance costs	378	587
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	670,528	390,930
Inventories	(7,387)	(239,565)
Prepaid expenses and other assets	(30,344)	(60,238)
Accounts payable	(1,132,019)	65,487
Accrued expenses and other liabilities	(150,465)	(3,008)
Total adjustments	(600,317)	194,704
Net cash (used in) provided by operating activities	(566,618)	225,358
Supplemental schedule of non-cash investing activities:
Issuance of stock to acquire business	$ 0	$ 247,232