Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash flows from operating activities:
Cash received from customers	$ 9,501,659	$ 7,093,723
Cash paid to vendors and employees	(9,238,349)	(6,793,778)
Interest paid, net	(19,456)	(8,369)
Income taxes paid	(19,496)	(15,821)
Net cash provided by operating activities	224,358	275,755
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(2,249,959)	0
Expenditures for property and equipment	(4,373)	(7,166)
Software and software development costs	(26,073)	(4,397)
Net cash used in investing activities	(2,280,405)	(11,563)
Cash flows from financing activities:
Borrowings on long-term debt	1,008,148	0
Principal payments on long-term debt	(200,000)	0
Cash paid for debt issuance costs	(5,121)	0
Net repayments on revolving credit loans	(7,589)	(1,187)
Payments for employee tax withholdings on equity awards	(5,500)	(4,093)
Proceeds from the reissuance of treasury stock	389	146
Net cash provided by (used in) financing activities	790,327	(5,134)
Effect of exchange rate changes on cash and cash equivalents	1,670	35,507
Net (decrease) increase in cash and cash equivalents	(1,264,050)	294,565
Cash and cash equivalents at beginning of year	2,125,591	531,169
Cash and cash equivalents at end of period	861,541	825,734
Reconciliation of net income to net cash provided by operating activities:
Net income	30,654	33,373
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,683	14,047
Provision for losses on accounts receivable	3,910	(1,305)
Stock-based compensation expense	4,918	3,657
Accretion of debt discount and debt issuance costs	587	208
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	374,857	519,337
Inventories	(232,153)	93,260
Prepaid expenses and other assets	(58,892)	50,479
Accounts payable	71,321	(381,928)
Accrued expenses and other liabilities	(2,527)	(55,373)
Total adjustments	193,704	242,382
Net cash provided by operating activities	224,358	275,755
Supplemental schedule of non-cash investing activities:
Issuance of stock to acquire business	$ 247,232	$ 0