Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	May 31, 2011	May 31, 2010
Operating activities:
Net income	$ 37,105	$ 23,371
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	6,310	6,606
Amortization of acquired intangible assets	19,664	15,218
Stock-based compensation	23,268	14,224
Deferred income tax	(9,342)	(5,263)
Tax benefits related to stock benefit plans	10,739	13,683
Excess tax benefits from stock-based compensation	(26,737)	(8,889)
Other non-cash adjustments, net	(146)	50
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	17,516	40,579
Prepaid expenses and other assets	3,623	4,482
Accounts payable	(1,222)	(5,388)
Accrued liabilities and restructuring costs	(21,504)	(29,769)
Deferred revenue	24,064	12,601
Net cash provided by operating activities	83,338	81,505
Investing activities:
Purchases of short-term investments	(76)
Maturities and sales of short-term investments	1,424	157
Acquisitions, net of cash acquired	(22,579)	(42,626)
Proceeds from sales of private equity investments		32
Purchases of property and equipment	(3,837)	(2,458)
Restricted cash pledged as security	(1,852)	(1,880)
Net cash used in investing activities	(26,920)	(46,775)
Financing activities:
Proceeds from exercise of stock options	31,518	19,264
Proceeds from employee stock purchase program	1,806	1,374
Withholding taxes related to restricted stock net share settlement	(15,024)	(4,216)
Repurchases of the Company's common stock	(72,329)	(67,482)
Excess tax benefits from stock-based compensation	26,737	8,889
Principal payments on long-term debt	(1,119)	(2,404)
Net cash used in financing activities	(28,411)	(44,575)
Effect of foreign exchange rate changes on cash and cash equivalents	6,491	(5,626)
Net increase (decrease) in cash and cash equivalents	34,498	(15,471)
Cash and cash equivalents at beginning of period	243,989	292,529
Cash and cash equivalents at end of period	278,487	277,058
Supplemental disclosures:
Income taxes paid	7,466	13,992
Interest paid	$ 1,473	$ 1,593