Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2012	Feb. 28, 2011
Operating activities:
Net income	$ 20,619	$ 16,015
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	3,476	3,094
Amortization of acquired intangible assets	7,813	9,686
Stock-based compensation	15,324	11,481
Deferred income tax	(4,700)	(2,387)
Tax benefits related to stock benefit plans	6,703	9,545
Excess tax benefits from stock-based compensation	(5,856)	(9,228)
Other non-cash adjustments, net	(229)	(112)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	8,266	38,960
Prepaid expenses and other assets	6,244	(4,388)
Accounts payable	(1,165)	(5,681)
Accrued liabilities and restructuring costs	(36,305)	(35,216)
Deferred revenue	20,935	4,591
Net cash provided by operating activities	41,125	36,360
Investing activities:
Acquisitions, net of cash acquired		(22,579)
Purchases of property and equipment	(6,703)	(1,579)
Restricted cash pledged as security	(968)	779
Other investing activities, net	399	(71)
Net cash used in investing activities	(7,272)	(23,450)
Financing activities:
Proceeds from issuance of common stock	11,862	20,164
Proceeds from revolving credit facility, net	68,060
Repurchases of the Company's common stock	(67,525)	(24,430)
Withholding taxes related to restricted stock net share settlement	(4,403)	(4,589)
Excess tax benefits from stock-based compensation	5,856	9,228
Principal payments on long-term debt	(587)	(556)
Net cash provided by (used in) financing activities	13,263	(183)
Effect of foreign exchange rate changes on cash and cash equivalents	(893)	3,688
Net increase in cash and cash equivalents	46,223	16,415
Cash and cash equivalents at beginning of period	308,148	243,989
Cash and cash equivalents at end of period	354,371	260,404
Supplemental disclosures:
Interest paid	930	736
Income taxes paid (refund)	$ (2,105)	$ 3,402