DEBT (Summary of Changes in Long-Term Debt) (Details) - USD ($)		12 Months Ended
		Aug. 31, 2020		Aug. 31, 2019		Aug. 31, 2018
Debt Instrument [Line Items]
Current portion of long-term debt		$ 25,875,000		$ 14,855,000
Long-term debt (net of current portion)		63,711,000		87,720,000
Total	[2]	89,586,000	[1]	102,575,000
Proceeds from long-term debt incurred during the period total		57,882,000				$ 28,500,000
Regularly scheduled loan payments, Current		(5,393,000)		(4,467,000)
Regularly scheduled loan payments, Noncurrent		(9,771,000)		(8,472,000)
Regularly scheduled loan payments total	[2]	(15,164,000)		(12,939,000)
Refinances of short-term debt, Current		(11,046,000)
Refinances of short-term debt, Noncurrent		11,046,000
Refinances of short-term debt total	[2]
Reclassification of long-term debt, Current		3,875,000		15,394,000
Reclassification of long-term debt, Noncurrent		(3,875,000)		(15,394,000)
Reclassification of long-term debt total	[2]
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar, Current	[3]	64,000		93,000
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar, Noncurrent	[3]	(321,000)		(143,000)
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar total	[2],[3]	(257,000)		(50,000)
Current portion of long-term debt		19,437,000		25,875,000		14,855,000
Long-term debt (net of current portion)		112,610,000		63,711,000		87,720,000
Total	[2]	132,047,000	[4]	89,586,000	[1]	102,575,000
Colombia Subsidiary [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt incurred during the period, Noncurrent		25,000,000
Proceeds from long-term debt incurred during the period total	[2]	25,000,000
Guatemala Subsidiary [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt incurred during the period, Noncurrent		20,820,000
Proceeds from long-term debt incurred during the period total	[2]	20,820,000
Trinidad Subsidiary [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt incurred during the period, Current		6,062,000
Proceeds from long-term debt incurred during the period, Noncurrent		6,000,000
Proceeds from long-term debt incurred during the period total	[2]	12,062,000
Cash Asset [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral amount		0		0		0
NonCash Asset [Member]
Debt Instrument [Line Items]
Debt Instrument, Collateral amount		$ 158,600,000		$ 111,300,000		$ 125,900,000

[1] The carrying amount on non-cash assets assigned as collateral for these loans was $111.3 million. No cash assets were assigned as collateral for these loans.

[2] The carrying amount on non-cash assets assigned as collateral for these loans was $125.9 million. No cash assets were assigned as collateral for these loans.

[3] These foreign currency translation adjustments are recorded within other comprehensive loss.

[4] The carrying amount on non-cash assets assigned as collateral for these loans was $158.6 million. No cash assets were assigned as collateral for these loans.