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FAIR VALUE (Financial Assets and Liabilities Not Required to Be Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Nov. 30, 2017
Aug. 31, 2017
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities $ 832,133 $ 832,077
2027 Notes | Level 2 | Carrying Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [1] 300,000 300,000
2027 Notes | Level 2 | Fair Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [1] 307,431 314,286
2023 Notes    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities 330,000 330,000
2023 Notes | Level 2 | Carrying Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [1] 330,000 330,000
2023 Notes | Level 2 | Fair Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [1] 339,824 340,052
Revolving credit facility | Term Loan (Due 2022) | Level 2 | Carrying Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [2] 150,000 150,000
Revolving credit facility | Term Loan (Due 2022) | Level 2 | Fair Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [2] $ 150,000 $ 150,000
[1] The fair value of the notes is determined based on indicated market values.
[2] The Term Loan contains variable interest rates and its carrying value approximates fair value.