CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Operating activities:
Net income	$ 73,275	$ 60,696
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	10,992	9,801
Amortization of acquired intangible assets	26,719	26,788
Amortization of debt discount and transaction costs	6,820	579
Stock-based compensation	45,130	36,186
Deferred income tax	(20,183)	3,406
Tax benefits related to stock benefit plans	14,455	11,773
Excess tax benefits from stock-based compensation	(20,612)	(31,506)
Other non-cash adjustments, net	905	85
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(12,079)	15,887
Prepaid expenses and other assets	(8,975)	(8,962)
Accounts payable	159	(492)
Accrued liabilities and restructuring costs	(5,576)	(8,380)
Deferred revenue	54,285	28,273
Net cash provided by operating activities	165,315	144,134
Investing activities:
Acquisitions, net of cash acquired	(132,209)	(22,579)
Purchases of property and equipment	(16,366)	(7,458)
Restricted cash pledged as security	(1,169)	(3,978)
Other investing activities, net	376	1,365
Net cash used in investing activities	(149,368)	(32,650)
Financing activities:
Proceeds from issuance of convertible debt, net	584,450
Proceeds from revolving credit facility, net	116,648
Principal payments on debt	(151,785)	(1,690)
Proceeds from issuance of common stock	25,390	42,402
Repurchases of the Company's common stock	(220,265)	(145,216)
Withholding taxes related to restricted stock net share settlement	(17,383)	(17,472)
Excess tax benefits from stock-based compensation	20,612	31,506
Net cash provided by (used in) financing activities	357,667	(90,470)
Effect of foreign exchange rate changes on cash and cash equivalents	(6,488)	7,212
Net increase in cash and cash equivalents	367,126	28,226
Cash and cash equivalents at beginning of period	308,148	243,989
Cash and cash equivalents at end of period	675,274	272,215
Supplemental disclosures:
Interest paid	2,714	2,227
Income taxes paid	$ 4,234	$ 10,512