Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Operating Cash Flows:
Net income	$ 153,558	$ 138,634	$ 83,387
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant, and equipment	34,563	33,305	31,948
Amortization of intangible assets, debt costs and other	17,891	20,246	22,239
Loss on debt extinguishment	0	0	3,518
Write-off of debt discount and debt issuance costs	0	0	8,010
Stock-based compensation	29,350	23,697	21,658
Deferred income taxes	8,550	(1,634)	2,754
Changes in other long-term liabilities	(3,708)	(6,143)	2,889
Gain on converstion of equity method investment to controlling interest	0	0	(1,519)
Dividends received from unconsolidated entities, net of equity in income	1,290	4,358	4,874
Other	(11)	74	(7)
Changes in operating assets and liabilities, net of effect of acquired businesses:
Trade accounts receivable, net	(43,811)	(58,389)	(8,915)
Prepaid expenses and other	(17,774)	(21,861)	(16,295)
Term receivables, long-term	(21,285)	(30,980)	(54,637)
Accounts payable and accrued liabilities	4,473	(2,720)	(3,122)
Income taxes receivable and payable	(10,487)	(5,084)	(11,725)
Deferred revenue	(2,896)	45,784	18,881
Net cash provided by operating activities	149,703	139,287	103,938
Investing Cash Flows:
Proceeds from the sales and maturities of short-term investments	3,112	0	0
Purchases of short-term investments	7,820	0	0
Increase in restricted cash	0	0	(3,977)
Purchases of property, plant, and equipment	(30,761)	(45,130)	(41,555)
Acquisitions of business and equity interests and other intangible assets, net of cash acquired	(20,906)	(15,652)	(15,260)
Net cash used in investing activities	(56,375)	(60,782)	(60,792)
Financing Cash Flows:
Proceeds from issuance of common stock	53,013	46,756	37,460
Repurchase of common stock	(49,995)	(33,914)	(89,996)
Tax benefit from share options exercised	386	266	0
Dividends paid	(20,398)	0	0
Net increase (decrease) in short-term borrowing	3,748	(8,149)	(1,284)
Debt and equity issuance costs	0	0	9,020
Proceeds from notes payable	0	0	253,000
Repayments of notes payable	0	0	(219,919)
Repayments of other borrowings	(7,762)	(3,016)	0
Net cash (used in) provided by financing activities	(21,008)	1,943	(29,759)
Effect of exchange rate changes on cash and cash equivalents	(2,781)	(3,164)	(1)
Net change in cash and cash equivalents	69,539	77,284	13,386
Cash and cash equivalents at the beginning of the period	223,783	146,499	133,113
Cash and cash equivalents at the end of the period	$ 293,322	$ 223,783	$ 146,499