Fair Value Disclosures (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - Level 2 - USD ($) $ in Thousands		Nov. 30, 2018	Nov. 30, 2017
Senior Notes [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	[1]	$ 1,790,437	$ 2,086,070
Senior Notes [Member] | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes		1,853,438	2,292,250
Convertible Notes Payable [Member] | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible senior notes	[1]	229,788	228,572
Convertible Notes Payable [Member] | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible senior notes		$ 229,425	$ 278,300

[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.