Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Cash flows from operating activities:
Net income	$ 34,994	$ 59,871
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	7,337	8,402
Amortization of acquired intangibles and other	3,648	2,972
Stock-based compensation	18,194	16,360
Loss on disposal of property	47	0
Gain on dispositions	0	(70,991)
Asset impairment	0	111
Loss on sales of auction rate securities	2,554	0
Deferred income taxes	(390)	1,647
Excess tax benefit from stock plans	(434)	(1,188)
Allowances for accounts receivable	455	(123)
Changes in operating assets and liabilities:
Accounts receivable	8,325	19,967
Other assets	10,535	(5,690)
Accounts payable and accrued liabilities	(17,049)	(17,416)
Income taxes payable and uncertain tax positions	2,123	(22,762)
Deferred revenue	(1,870)	(4,439)
Net cash flows from (used in) operating activities	68,469	(13,279)
Cash flows from investing activities:
Purchases of investments	(1,900)	0
Sales and maturities of investments	14,935	25,685
Redemptions and sales of auction rate securities	26,196	25
Purchases of property and equipment	(7,183)	(2,989)
Capitalized software development costs	(3,008)	0
Payments for acquisitions, net of cash acquired	(12,493)	(9,450)
Proceeds from divestitures, net	3,300	111,120
Increase in other noncurrent assets	144	835
Net cash flows from investing activities	19,991	125,226
Cash flows from financing activities:
Proceeds from stock-based compensation plans	10,714	49,109
Purchases of common stock related to withholding taxes from the issuance of restricted stock units	(3,141)	(2,823)
Repurchases of common stock	(52,604)	(241,184)
Excess tax benefit from stock plans	434	1,188
Payment of contingent consideration	(210)	0
Net cash flows used in financing activities	(44,807)	(193,710)
Effect of exchange rate changes on cash	(91)	(4,687)
Net increase (decrease) in cash and cash equivalents	43,562	(86,450)
Cash and cash equivalents, beginning of period	198,818	301,792
Cash and cash equivalents, end of period	242,380	215,342
Supplemental disclosure:
Cash paid for income taxes, net of refunds of $296 in 2014 and $4,324 in 2013	6,300	66,596
Non-cash financing activities:
Total fair value of restricted stock awards, restricted stock units and deferred stock units on date vested	10,525	9,890
Unsettled repurchases of common stock	$ 0	$ 3,301