Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 29, 2012	Feb. 28, 2011
Cash flows from operating activities:
Net income	$ 7,489	$ 20,521
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	2,336	2,212
Amortization of acquired intangibles and other	6,226	6,249
Stock-based compensation	7,091	4,184
Deferred income taxes	589	(187)
Tax benefit from stock plans	275	3,361
Excess tax benefit from stock plans	(705)	(2,723)
Allowances for accounts receivable	200
Changes in operating assets and liabilities:
Accounts receivable	9,307	17,667
Other assets	103	506
Accounts payable and accrued liabilities	(3,195)	(22,861)
Income taxes payable and uncertain tax positions	(4,382)	3,650
Deferred revenue	13,195	17,651
Net cash flows from operating activities	38,529	50,230
Cash flows from investing activities:
Purchases of investments	(6,623)	(26,285)
Sales and maturities of investments	27,195	3,430
Redemptions at par by issuers of auction rate securities	225	200
Purchases of property and equipment	(3,942)	(3,352)
(Increase) decrease in other noncurrent assets	(350)	65
Net cash flows from investing activities	16,505	(25,942)
Cash flows from financing activities:
Issuance of common stock	13,973	18,857
Withholding tax payments related to net issuance of restricted stock units	(884)
Repurchase of common stock		(24,977)
Excess tax benefit from stock plans	705	2,723
Payment of long-term debt	(183)	(86)
Net cash flows from financing activities	13,611	(3,483)
Effect of exchange rate changes on cash	1,955	4,784
Net increase in cash and equivalents	70,600	25,589
Cash and cash equivalents, beginning of period	161,095	286,559
Cash and cash equivalents, end of period	231,695	312,148
Supplemental disclosure:
Cash paid for income taxes, net of refunds of $127 in 2012 and $3,582 in 2011	$ 7,717	$ 37