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FAIR VALUE FAIR VALUE (Financial Assets and Liabilities Not Required to Be Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities $ 1,170,129 $ 832,077
2027 Notes    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities 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] 281,655 314,286
2026 Notes    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities 350,000 0
2026 Notes | Level 2 | Fair Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [1] 339,238 0
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 | Fair Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [1] 326,090 340,052
2022 Term Loan | Level 2 | Fair Value    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Financial liabilities [2] $ 142,500 $ 150,000
[1] (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.