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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Schedule of Notional Amounts of Outstanding Derivative Positions) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands | May 31, 2018 | Aug. 31, 2017
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Derivative [Line Items] |  |
Derivative Liability, Notional Amount | $ 75,749 | $ 75,512
Union Bank [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Notional Amount | 35,700 | 35,700
Citibank [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Notional Amount | 28,725 | 26,088
Scotiabank [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Notional Amount | $ 11,324 | $ 13,724

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