Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Operating activities:
Net income	$ 84,208	$ 122,114	$ 112,635
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	16,340	14,931	13,145
Amortization of acquired intangible assets	36,782	35,553	34,661
Amortization of debt discount and transaction costs	19,093	11,465	772
Stock-based compensation	53,635	61,146	48,867
Deferred income tax	(16,397)	(20,351)	1,266
Tax benefits related to employee stock option plans	14,343	24,561	8,552
Excess tax benefits from stock-based compensation	(18,539)	(30,311)	(41,950)
Other non-cash adjustments, net	1,442	1,486	476
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	2,870	(37,171)	(3,312)
Prepaid expenses and other assets	(13,860)	(1,880)	4,859
Accounts payable	14,221	(3,036)	501
Accrued liabilities and restructuring costs	20,307	(1,542)	7,015
Deferred revenue	(8,424)	60,395	20,563
Net cash provided by operating activities	206,021	237,360	208,050
Investing activities:
Purchases of short-term investments	(70,786)	(41,409)	(76)
Maturities and sales of short-term investments	22,657	7,229	1,451
Acquisitions, net of cash acquired	(74,898)	(132,209)	(63,610)
Purchases of property and equipment	(19,269)	(23,723)	(13,971)
Restricted cash pledged as security	(1,165)	(1,169)	(3,234)
Other investing activities, net	(212)	326	0
Net cash used in investing activities	(143,673)	(190,955)	(79,440)
Financing activities:
Proceeds from issuance of convertible debt, net	0	584,450	0
Proceeds from revolving credit facility	0	116,648	30,000
Principal payments on debt	(35,711)	(152,397)	(2,269)
Proceeds from issuance of common stock	30,702	33,417	80,610
Repurchases of the Company’s common stock	(130,741)	(220,265)	(194,059)
Withholding taxes related to restricted stock net share settlement	(13,279)	(18,212)	(17,922)
Excess tax benefits from stock-based compensation	18,539	30,311	41,950
Net cash (used in) provided by financing activities	(130,490)	373,952	(61,690)
Effect of foreign exchange rate changes on cash and cash equivalents	2,942	(1,196)	(2,761)
Net (decrease) increase in cash and cash equivalents	(65,200)	419,161	64,159
Cash and cash equivalents at beginning of year	727,309	308,148	243,989
Cash and cash equivalents at end of year	662,109	727,309	308,148
Supplemental disclosures:
Interest paid	14,933	10,536	2,994
Income taxes paid	$ 25,460	$ 12,967	$ 12,883