Consolidated Statement Of Cash Flows - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Gain (Loss) on Disposition of Assets	$ 0	$ (2,350,000)	$ 0
Cash flows from operating activities:
Cash received from customers	28,119,687,000	29,380,493,000	28,253,552,000
Cash paid to vendors and employees	(27,824,548,000)	(29,177,542,000)	(27,775,887,000)
Interest paid, net	(20,264,000)	(24,546,000)	(23,082,000)
Income taxes paid	(85,882,000)	(59,024,000)	(75,435,000)
Net cash provided by operating activities	188,993,000	119,381,000	379,148,000
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(27,848,000)	0	6,377,000
Payments to Acquire Intangible Assets	0	0	(1,519,000)
Expenditures for property and equipment	(20,917,000)	(18,639,000)	(15,598,000)
Proceeds from Sale of Buildings	0	7,121,000	0
Software and software development costs	(13,055,000)	(9,536,000)	(13,271,000)
Proceeds from Divestiture of Businesses	20,020,000	0
Net cash used in investing activities	(41,800,000)	(21,054,000)	(24,011,000)
Cash flows from financing activities:
Proceeds from the reissuance of treasury stock	561,000	1,456,000	1,139,000
Cash paid for purchase of treasury stock	(147,003,000)	(52,997,000)	0
Payments for Acquisition Earn-Out	(2,736,000)	(5,060,000)	(6,183,000)
Net borrowings (repayments) on revolving credit loans	(5,912,000)	(7,269,000)	122,656,000
Principal payments on long-term debt	(319,000)	(546,000)	(538,000)
Excess tax benefit from stock-based compensation	237,000	749,000	927,000
Net cash used in financing activities	(143,348,000)	(49,129,000)	(127,311,000)
Cash and cash equivalents at beginning of year	542,995,000	570,101,000	340,564,000
Effect of exchange rate changes on cash and cash equivalents	(15,671,000)	(72,057,000)	1,711,000
Net (decrease) increase in cash and cash equivalents	(11,826,000)	(22,859,000)	229,537,000
Less: Cash balance of businesses held for sale at end of year	0	(4,247,000)	0
Cash and cash equivalents at end of year	531,169,000	542,995,000	570,101,000
Reconciliation of net income to net cash provided by operating activities:
Net income	265,736,000	175,172,000	179,932,000
Loss on disposal of subsidiaries	699,000	1,330,000	0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,253,000	68,746,000	72,979,000
Provision for losses on accounts receivable	6,061,000	10,415,000	11,725,000
Stock-based compensation expense	14,890,000	13,668,000	8,858,000
Accretion of debt discount and debt issuance costs on Senior Notes	839,000	839,000	839,000
Deferred income taxes	2,387,000	(335,000)	(53,484,000)
Excess tax benefit from stock-based compensation	(237,000)	(749,000)	(927,000)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(297,637,000)	22,166,000	(36,031,000)
Inventories	(219,482,000)	245,474,000	(209,383,000)
Prepaid expenses and other assets	(44,384,000)	31,254,000	77,162,000
Accounts payable	(426,412,000)	469,757,000	(321,254,000)
Accrued expenses and other liabilities	23,544,000	(23,508,000)	(6,224,000)
Total adjustments	(76,743,000)	(55,791,000)	199,216,000
Net cash provided by operating activities	$ 188,993,000	$ 119,381,000	$ 379,148,000