CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Operating activities:
Net income	$ 16,370	$ 39,619
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	14,424	11,616
Amortization of acquired intangible assets	30,506	26,965
Amortization of debt discount and transaction costs	14,869	14,258
Stock-based compensation	31,902	39,245
Deferred income tax	(3,931)	(13,292)
Tax benefits related to stock benefit plans	4,404	9,691
Excess tax benefits from stock-based compensation	(11,300)	(13,442)
Other non-cash adjustments, net	645	1,179
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	37,766	49,181
Prepaid expenses and other assets	(8,946)	(19,568)
Accounts payable and accrued liabilities	(57,341)	12,071
Deferred revenue	(7,664)	(11,119)
Net cash provided by operating activities	61,704	146,404
Investing activities:
Purchases of short-term investments	(207,302)	(38,261)
Maturities and sales of short-term investments	110,263	15,346
Acquisitions, net of cash acquired	(181,415)	(53,917)
Purchases of property and equipment	(23,472)	(10,695)
Other investing activities, net	1,378	(1,047)
Net cash used in investing activities	(300,548)	(88,574)
Financing activities:
Principal payments on debt	0	(35,711)
Proceeds from issuance of common stock	30,814	23,089
Repurchases of common stock	(95,588)	(105,289)
Withholding taxes related to restricted stock net share settlement	(10,613)	(12,467)
Excess tax benefits from stock-based compensation	11,300	13,442
Net cash used in financing activities	(64,087)	(116,936)
Effect of foreign exchange rate changes on cash and cash equivalents	(4,812)	(1,992)
Net decrease in cash and cash equivalents	(307,743)	(61,098)
Cash and cash equivalents at beginning of period	662,109	727,309
Cash and cash equivalents at end of period	354,366	666,211
Supplemental disclosures:
Interest paid	7,496	7,712
Income taxes paid	$ 13,499	$ 19,670