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Notes Payable, Long-Term Debt and Capital Lease Obligations (Additional Information) (Fair Value) (Details 4)
$ in Millions
Nov. 30, 2017
USD ($)
8.250% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes $ 405.6
5.625% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes 431.2
4.700% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes 525.3
4.900% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes $ 311.7