Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Operating activities:
Net income	$ 60,696	$ 40,835
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	9,801	10,020
Amortization of acquired intangible assets	26,788	23,235
Stock-based compensation	36,186	23,093
Deferred income tax	3,406	(11,282)
Tax benefits related to stock benefit plans	11,773	18,502
Excess tax benefits from stock-based compensation	(31,506)	(11,729)
Other non-cash adjustments, net	85	39
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	15,887	32,903
Prepaid expenses and other assets	(8,383)	3,315
Accounts payable	(492)	(3,354)
Accrued liabilities and restructuring costs	(8,380)	(19,546)
Deferred revenue	28,273	7,378
Net cash provided by operating activities	144,134	113,409
Investing activities:
Purchases of short-term investments	(76)
Maturities and sales of short-term investments	1,441	169
Acquisitions, net of cash acquired	(22,579)	(42,578)
Proceeds from sales of private equity investments		32
Purchases of property and equipment	(7,458)	(4,319)
Restricted cash pledged as security	(3,978)	(3,669)
Net cash used in investing activities	(32,650)	(50,365)
Financing activities:
Proceeds from exercise of stock options	38,472	31,842
Proceeds from employee stock purchase program	3,930	2,952
Withholding taxes related to restricted stock net share settlement	(17,472)	(6,035)
Repurchases of the Company's common stock	(145,216)	(101,538)
Excess tax benefits from stock-based compensation	31,506	11,729
Principal payments on long-term debt	(1,690)	(2,944)
Net cash used in financing activities	(90,470)	(63,994)
Effect of foreign exchange rate changes on cash and cash equivalents	7,212	(2,748)
Net increase (decrease) in cash and cash equivalents	28,226	(3,698)
Cash and cash equivalents at beginning of period	243,989	292,529
Cash and cash equivalents at end of period	272,215	288,831
Supplemental disclosures:
Income taxes paid	10,512	18,509
Interest paid	$ 2,227	$ 2,088