DEBT (Summary of Changes in Long-Term Debt) (Details) - USD ($) $ in Thousands		9 Months Ended
		May 31, 2017	May 31, 2016	Aug. 31, 2016
Debt Instrument [Line Items]
Current portion of long-term debt		$ 14,565
Long-term debt (net of current portion)		73,542
Total	[1]	88,107
Proceeds from long-term debt total		47,700	$ 7,370
Regularly scheduled loan payments, Current		(225)
Regularly scheduled loan payments, Noncurrent		(10,784)
Regularly scheduled loan payments total		(11,009)
Translation adjustments on foreign-currency debt of subsidiaries whose functional currency is not the U.S. dollar, Current	[2]	36
Translation adjustments on foreign-currency debt of subsidiaries whose functional currency is not the U.S. dollar, Noncurrent	[2]	(120)
Translation adjustments on foreign-currency debt of subsidiaries whose functional currency is not the U.S. dollar	[2]	(84)
Current portion of long-term debt		20,376
Long-term debt (net of current portion)		104,338
Total	[3]	124,714
Cash Asset [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral amount		0		$ 0
NonCash Asset [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral amount		124,100		$ 102,400
Union Bank [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt incurred during the period, Noncurrent		35,700
Proceeds from long-term debt total		35,700
Trinidad [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt incurred during the period, Current		6,000
Proceeds from long-term debt incurred during the period, Noncurrent		6,000
Proceeds from long-term debt total		$ 12,000

[1] The carrying amount of non-cash assets assigned as collateral for these loans was $102.4 million. No cash assets were assigned as collateral for these loans.

[2] These foreign currency translation adjustments are recorded within Other comprehensive income.

[3] The carrying amount of non-cash assets assigned as collateral for these loans was $124.1 million. No cash assets were assigned as collateral for these loans.