Cash, Cash Equivalents and Short-Term Investments (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2013	Nov. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 3,858,146	$ 3,523,902
Unrealized Gains	9,926	14,711
Unrealized Losses	(2,364)	(260)
Estimated Fair Value, Total cash, cash equivalents and short-term investments	3,865,708	3,538,353
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,246,411	1,425,052
Unrealized Gains	0	0
Unrealized Losses	(1)	0
Estimated Fair Value, cash and cash equivalents	1,246,410	1,425,052
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	322,438	200,771
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value, cash and cash equivalents	322,438	200,771
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	923,973	1,224,281
Unrealized Gains	0	0
Unrealized Losses	(1)	0
Estimated Fair Value, cash and cash equivalents	923,972	1,224,281
Cash equivalents [Member] \| Corporate bonds and commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,992	3,998
Unrealized Gains	0	0
Unrealized Losses	(1)	0
Estimated Fair Value, cash and cash equivalents	23,991	3,998
Cash equivalents [Member] \| Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	761,427
Unrealized Gains	0
Unrealized Losses	0
Estimated Fair Value, cash and cash equivalents	761,427
Cash equivalents [Member] \| Money Market Mutual Funds and Repurchase Agreements [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,171,270
Unrealized Gains		0
Unrealized Losses		0
Estimated Fair Value, cash and cash equivalents		1,171,270
Cash equivalents [Member] \| Municipal securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,895
Unrealized Gains		0
Unrealized Losses		0
Estimated Fair Value, cash and cash equivalents		3,895
Cash equivalents [Member] \| Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	138,554	45,118
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value, cash and cash equivalents	138,554	45,118
Short-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,611,735	2,098,850
Unrealized Gains	9,926	14,711
Unrealized Losses	(2,363)	(260)
Estimated Fair Value, short-term investments	2,619,298	2,113,301
Short-term investments [Member] \| Marketable equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	180	237
Unrealized Gains	159	7
Unrealized Losses	0	0
Estimated Fair Value, short-term investments	339	244
Short-term fixed income securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,611,555	2,098,613
Unrealized Gains	9,767	14,704
Unrealized Losses	(2,363)	(260)
Estimated Fair Value, short-term investments	2,618,959	2,113,057
Short-term fixed income securities [Member] \| Corporate bonds and commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,406,253	1,059,158
Unrealized Gains	7,714	11,415
Unrealized Losses	(1,501)	(133)
Estimated Fair Value, short-term investments	1,412,466	1,070,440
Short-term fixed income securities [Member] \| Foreign government securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,863	6,919
Unrealized Gains	44	45
Unrealized Losses	(9)	(12)
Estimated Fair Value, short-term investments	14,898	6,952
Short-term fixed income securities [Member] \| Municipal securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	194,428	180,488
Unrealized Gains	277	97
Unrealized Losses	(31)	(60)
Estimated Fair Value, short-term investments	194,674	180,525
Short-term fixed income securities [Member] \| Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		20,113
Unrealized Gains		0
Unrealized Losses		0
Estimated Fair Value, short-term investments		20,113
Short-term fixed income securities [Member] \| U.S. agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	534,734	501,863
Unrealized Gains	1,445	2,346
Unrealized Losses	(363)	(18)
Estimated Fair Value, short-term investments	535,816	504,191
Short-term fixed income securities [Member] \| U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	461,277	330,072
Unrealized Gains	287	801
Unrealized Losses	(459)	(37)
Estimated Fair Value, short-term investments	$ 461,105	$ 330,836

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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