Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Cash flows from operating activities:
Net income	$ 31,118	$ 7,489
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	2,418	2,336
Amortization of acquired intangibles and other	983	6,226
Stock-based compensation	4,906	7,091
Gain on sale of dispositions	(35,106)	0
Asset impairment	111	0
Deferred income taxes	(1,899)	589
Tax benefit from stock plans	(481)	275
Excess tax benefit from stock plans	(508)	(705)
Allowances for accounts receivable	(150)	200
Changes in operating assets and liabilities:
Accounts receivable	12,622	9,307
Other assets	(4,833)	103
Accounts payable and accrued liabilities	(22,867)	(3,195)
Income taxes payable and uncertain tax positions	(21,627)	(4,382)
Deferred revenue	10,254	13,195
Net cash flows from operating activities	(25,059)	38,529
Cash flows from investing activities:
Purchases of investments	0	(6,623)
Sales and maturities of investments	10,860	27,195
Redemptions and sales of auction rate securities	25	225
Purchases of property and equipment	(898)	(3,942)
Proceeds from divestitures, net	73,381	0
Increase in other noncurrent assets	(53)	(350)
Net cash flows from investing activities	83,315	16,505
Cash flows from financing activities:
Proceeds from stock-based compensation plans	29,233	13,973
Purchases of common stock related to withholding taxes from the issuance of restricted stock units	(431)	(884)
Repurchases of common stock	(109,302)	0
Excess tax benefit from stock plans	508	705
Payment of long-term debt	0	(183)
Net cash flows from financing activities	(79,992)	13,611
Effect of exchange rate changes on cash	(839)	1,955
Net (decrease) increase in cash and cash equivalents	(22,575)	70,600
Cash and cash equivalents, beginning of period	301,792	161,095
Cash and cash equivalents, end of period	279,217	231,695
Supplemental disclosure:
Cash paid for income taxes, net of refunds of $126 in 2013 and $127 in 2012	47,290	7,717
Non-cash financing activities:
Total fair value of restricted stock awards, restricted stock units and deferred stock units on date vested	2,576	2,234
Unsettled repurchases of common stock	$ 4,041	$ 0