Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands	May 31, 2019	Nov. 30, 2018
Schedule of Available-for-sale Securities
Amortized Cost	$ 3,481,805	$ 3,254,290
Unrealized Gains	910	45
Unrealized Losses	(3,736)	(25,373)
Estimated Fair Value, Total cash, cash equivalents and short-term investments	3,478,979	3,228,962
Cash and cash equivalents
Schedule of Available-for-sale Securities
Amortized Cost	2,082,918	1,642,775
Unrealized Gains	0	0
Unrealized Losses	(8)	0
Cash and Cash Equivalents, Fair Value Disclosure	2,082,910	1,642,775
Cash
Schedule of Available-for-sale Securities
Amortized Cost	400,023	368,564
Unrealized Gains	0	0
Unrealized Losses	0	0
Cash and Cash Equivalents, Fair Value Disclosure	400,023	368,564
Cash equivalents
Schedule of Available-for-sale Securities
Amortized Cost	1,682,895	1,274,211
Unrealized Gains	0	0
Unrealized Losses	(8)	0
Cash and Cash Equivalents, Fair Value Disclosure	1,682,887	1,274,211
Cash equivalents \| Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	144,563
Unrealized Gains	0
Unrealized Losses	(8)
Cash and Cash Equivalents, Fair Value Disclosure	144,555
Cash equivalents \| Money market mutual funds
Schedule of Available-for-sale Securities
Amortized Cost	1,474,933	1,234,188
Unrealized Gains	0	0
Unrealized Losses	0	0
Cash and Cash Equivalents, Fair Value Disclosure	1,474,933	1,234,188
Cash equivalents \| Municipal securities
Schedule of Available-for-sale Securities
Amortized Cost	1,000
Unrealized Gains	0
Unrealized Losses	0
Cash and Cash Equivalents, Fair Value Disclosure	1,000
Cash equivalents \| Time deposits
Schedule of Available-for-sale Securities
Amortized Cost	57,400	40,023
Unrealized Gains	0	0
Unrealized Losses	0	0
Cash and Cash Equivalents, Fair Value Disclosure	57,400	40,023
Cash equivalents \| U.S. agency securities
Schedule of Available-for-sale Securities
Amortized Cost	4,999
Unrealized Gains	0
Unrealized Losses	0
Cash and Cash Equivalents, Fair Value Disclosure	4,999
Short-term fixed income securities
Schedule of Available-for-sale Securities
Amortized Cost	1,398,887	1,611,515
Unrealized Gains	910	45
Unrealized Losses	(3,728)	(25,373)
Estimated Fair Value, short-term investments	1,396,069	1,586,187
Short-term fixed income securities \| Asset-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	61,145	41,875
Unrealized Gains	59	0
Unrealized Losses	(80)	(367)
Estimated Fair Value, short-term investments	61,124	41,508
Short-term fixed income securities \| Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	1,314,844	1,546,860
Unrealized Gains	804	44
Unrealized Losses	(3,616)	(24,696)
Estimated Fair Value, short-term investments	1,312,032	1,522,208
Short-term fixed income securities \| Foreign government securities
Schedule of Available-for-sale Securities
Amortized Cost	2,399	4,179
Unrealized Gains	0	0
Unrealized Losses	(6)	(24)
Estimated Fair Value, short-term investments	2,393	4,155
Short-term fixed income securities \| Municipal securities
Schedule of Available-for-sale Securities
Amortized Cost	20,499	18,601
Unrealized Gains	47	1
Unrealized Losses	(26)	(286)
Estimated Fair Value, short-term investments	$ 20,520	$ 18,316

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Cash 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 customer may deposit additional funds at any time and 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. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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