Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Cash flows from operating activities:
Net income	$ 59,871	$ 11,419
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	8,402	6,990
Amortization of acquired intangibles and other	2,972	18,379
Stock-based compensation	16,360	21,504
Gain on dispositions	(70,991)	0
Asset impairment	111	875
Deferred income taxes	2,179	888
Tax (deficiency) benefit from stock plans	(532)	563
Excess tax benefit from stock plans	(1,188)	(1,338)
Allowances for accounts receivable	(123)	774
Changes in operating assets and liabilities:
Accounts receivable	19,967	30,250
Other assets	(5,690)	(5,412)
Accounts payable and accrued liabilities	(17,416)	4,201
Income taxes payable and uncertain tax positions	(22,762)	(2,760)
Deferred revenue	(4,439)	(10,619)
Net cash flows (used in) from operating activities	(13,279)	75,714
Cash flows from investing activities:
Purchases of investments	0	(27,924)
Sales and maturities of investments	25,685	70,185
Redemptions and sales of auction rate securities	25	2,925
Purchases of property and equipment	(2,989)	(6,606)
Payments for acquisitions, net of cash acquired	(9,450)	0
Proceeds from divestitures, net	111,120	0
Increase in other noncurrent assets	835	247
Net cash flows from investing activities	125,226	38,827
Cash flows from financing activities:
Proceeds from stock-based compensation plans	49,109	24,284
Purchases of common stock related to withholding taxes from the issuance of restricted stock units	(2,823)	(2,681)
Repurchases of common stock	(241,184)	0
Excess tax benefit from stock plans	1,188	1,338
Payment of long-term debt	0	(357)
Net cash flows (used in) from financing activities	(193,710)	22,584
Effect of exchange rate changes on cash	(4,687)	(3,822)
Net (decrease) increase in cash and cash equivalents	(86,450)	133,303
Cash and cash equivalents, beginning of period	301,792	161,095
Cash and cash equivalents, end of period	215,342	294,398
Supplemental disclosure:
Cash paid for income taxes, net of refunds of $4,324 in 2013 and $632 in 2012	66,596	13,912
Non-cash financing activities:
Total fair value of restricted stock awards, restricted stock units and deferred stock units on date vested	9,890	8,669
Unsettled repurchases of common stock	$ 3,301	$ 0