FAIR VALUE (Financial Assets and Liabilities Not Required to Be Measured at Fair Value) (Details) - USD ($) $ in Thousands	Feb. 28, 2018	Aug. 31, 2017
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Financial liabilities	$ 825,858	$ 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 | Carrying Value
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	303,600	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	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	339,847	340,052
Revolving credit facility | 2022 Term Loan | Level 2 | Carrying Value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Financial liabilities	146,250	150,000
Revolving credit facility | 2022 Term Loan | Level 2 | Fair Value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Financial liabilities	$ 146,250	$ 150,000