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Fair Value Disclosures (Details 1) - USD ($)
$ in Thousands
Nov. 30, 2016
Nov. 30, 2015
Jan. 29, 2013
Convertible senior notes due February 1, 2019 at 1.375%      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes, rate 1.375% 1.375% 1.375%
Carrying Value | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, Fair Value [1] $ 2,345,843 $ 2,339,920  
Convertible Debt, Fair Value Disclosures [1] 227,379 226,170  
Estimate of Fair Value Measurement [Member] | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt, Fair Value [1] 2,494,844 2,429,850  
Convertible Debt, Fair Value Disclosures [1] $ 223,675 $ 211,313  
[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.