Fair Value Disclosures (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - Level 2 - USD ($) $ in Thousands		Nov. 30, 2019	Nov. 30, 2018
Senior Notes [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	[1]	$ 1,740,858	$ 1,790,437
Senior Notes [Member] | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes		1,921,563	1,853,438
Convertible Notes Payable [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible senior notes	[1]	0	229,788
Convertible Notes Payable [Member] | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible senior notes		$ 0	$ 229,425

[1] The carrying values for the senior notes and convertible senior notes, as presented, include unamortized debt issuance costs. Debt issuance costs are not factored into the estimated fair values of these notes.