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Notes Payable, Long-Term Debt and Capital Lease Obligations (Fair Value) (Details 5)
$ in Millions
Aug. 31, 2017
USD ($)
8.250% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes $ 414.0
5.625% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes 433.6
4.700% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes 530.6
4.900% Senior Notes  
Debt Instrument [Line Items]  
Estimated fair value of senior notes $ 316.6