Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Operating Cash Flows:
Net income	$ 154,866	$ 94,176	$ 145,177
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant, and equipment	39,867	36,449	34,336
Amortization of intangible assets, debt costs and other	21,980	24,973	23,710
Stock-based compensation	46,793	40,497	35,807
Deferred income taxes	12,332	5,055	9,265
Changes in other long-term liabilities	2,620	(804)	876
Equity in income of unconsolidated entities, net of dividends received	1,267	(455)	507
Other	98	(696)	85
Changes in operating assets and liabilities, net of effect of acquired businesses:
Trade accounts receivable, net	(22,694)	49,751	(90,404)
Prepaid expenses and other	(8,028)	(13,558)	(16,348)
Term receivables, long-term	(36,259)	31,672	(34,808)
Accounts payable and accrued liabilities	47,114	(37,519)	4,832
Income taxes receivable and payable	3,320	3,984	1,722
Deferred revenue	58,535	(2,275)	26,082
Net cash provided by operating activities	321,811	231,250	140,839
Investing Cash Flows:
Proceeds from the sales and maturities of short-term investments	0	0	4,124
Proceeds from sale of building	0	2,068	0
Purchases of property, plant, and equipment	(60,288)	(43,336)	(48,366)
Acquisitions of businesses and equity interests, net	(11,759)	(11,700)	(84,596)
Net cash used in investing activities	(72,047)	(52,968)	(128,838)
Financing Cash Flows:
Proceeds from issuance of common stock	32,490	32,807	29,990
Repurchase of common stock	(146,050)	(85,000)	(70,053)
Payments related to tax withholding on vesting of share based awards	(4,716)	(2,437)	(2,351)
Dividends paid	(23,808)	(25,590)	(22,911)
Net increase (decrease) in short-term borrowing, excluding revolving credit facility	3,236	1,190	(2,660)
Proceeds from revolving credit facility	0	25,000	0
Repayments of revolving credit facility	(5,000)	0	0
Repayments of other borrowings	(1,475)	(7,268)	(3,659)
Purchase of remaining noncontrolling interest in majority owned subsidiaries	0	(11,270)	0
Proceeds (payments) for the sale of subsidiary shares from (to) noncontrolling interest	0	7	(41)
Net cash used in financing activities	(145,323)	(72,561)	(71,685)
Effect of exchange rate changes on cash and cash equivalents	1,820	(1,176)	(3,357)
Net change in cash and cash equivalents	106,261	104,545	(63,041)
Cash and cash equivalents at the beginning of the period	334,826	230,281	293,322
Cash and cash equivalents at the end of the period	$ 441,087	$ 334,826	$ 230,281