Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Cash flows from operating activities:
Net income	$ 47,444	$ 59,629	$ 48,098
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	9,305	8,832	10,859
Amortization of acquired intangibles and other	21,660	26,246	30,558
Stock-based compensation	28,233	25,999	18,121
Gain on sale of dispositions	(45,105)	0	0
Impairment loss on assets held for sale	8,601	0	0
Loss on sale of auction rate security	270	0	0
Loss on disposal of property and equipment	0	114	0
Asset impairment	898	0	0
Deferred income taxes	(22)	2,468	3,762
Tax benefit from stock plans	171	6,165	9,465
Excess tax benefits from stock plans	(1,590)	(6,238)	(6,046)
Allowances for accounts receivable	1,140	1,963	(1,400)
Changes in operating assets and liabilities:
Accounts receivable	14,373	8,053	(18,971)
Other assets	1,547	2,709	(3,159)
Accounts payable and accrued liabilities	7,484	(24,679)	12,469
Income taxes payable and uncertain tax positions	17,617	9,640	(6,632)
Deferred revenue	(7,911)	5,393	(923)
Net cash flows from operating activities	104,115	126,294	96,201
Cash flows from investing activities:
Purchases of investments	(27,924)	(152,658)	(38,632)
Sales and maturities of investments	74,065	84,441	33,318
Redemptions and sales of auction rate securities - available-for-sale	8,955	6,300	1,235
Redemptions of auction rate securities - trading	0	0	17,740
Purchases of property and equipment	(7,735)	(17,047)	(9,664)
Payments for acquisitions, net of cash acquired	0	(22,900)	(49,186)
Proceeds from divestitures, net	46,590	0	0
Decrease (increase) in other noncurrent assets	189	(433)	26
Net cash flows from investing activities	94,140	(102,297)	(45,163)
Cash flows from financing activities:
Proceeds from stock-based compensation plans	29,208	49,672	93,670
Purchase of common stock related to withholding taxes from issuance of restricted stock units	(4,153)	(2,706)	(1,858)
Repurchase of common stock	(81,316)	(200,009)	(29,336)
Excess tax benefit from stock plans	1,590	6,238	6,046
Payment of long-term debt	(357)	(388)	(358)
Payment of issuance costs for line of credit	0	(795)	0
Net cash flows from financing activities	(55,028)	(147,988)	68,164
Effect of exchange rate changes on cash	(2,530)	(1,473)	(8,516)
Net increase (decrease) in cash and equivalents	140,697	(125,464)	110,686
Cash and equivalents, beginning of year	161,095	286,559	175,873
Cash and equivalents, end of year	301,792	161,095	286,559
Supplemental disclosure:
Cash paid for income taxes, net of refunds of $1,987 in 2012, $9,183 in 2011 and $2,127 in 2010	15,337	9,545	15,911
Non-cash financing activity:
Total fair value of restricted stock awards, restricted stock units and deferred units on date vested	13,886	9,160	6,333
Unsettled repuchases of common stock	$ 7,068