DEBT (Summary of Changes in Long-Term Debt) (Details) - USD ($)	12 Months Ended
	Aug. 31, 2019		Aug. 31, 2018		Aug. 31, 2017
Debt Instrument [Line Items]
Current portion of long-term debt	$ 14,855,000		$ 18,358,000
Long-term debt (net of current portion)	87,720,000		87,939,000
Total	102,575,000	[1]	106,297,000	[2]
Regularly scheduled loan payments, Current	(4,467,000)		(4,052,000)
Regularly scheduled loan payments, Noncurrent	(8,472,000)		(12,673,000)
Regularly scheduled loan payments total	(12,939,000)		(16,725,000)
Reclassification of long-term debt, Current	15,394,000		3,005,000
Reclassification of long-term debt, Noncurrent	(15,394,000)		(3,005,000)
Reclassification of long-term debt total
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar, Current	93,000	[3]	144,000
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar, Noncurrent	(143,000)	[3]	(278,000)
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar total	(50,000)	[3]	(134,000)
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	89,586,000	[4]	102,575,000	[1]
Panama Subsidiary [Member]
Debt Instrument [Line Items]
Current portion of long-term debt	1,500,000
Long-term debt (net of current portion)	13,500,000
Total	15,000,000
Current portion of long-term debt			1,500,000
Long-term debt (net of current portion)			13,500,000
Total			15,000,000
Honduras Subsidiary [Member]
Debt Instrument [Line Items]
Total	13,500,000
Proceeds from long-term debt incurred during the period, Current			1,350,000
Proceeds from long-term debt incurred during the period, Noncurrent			12,150,000
Total			13,500,000
Trinidad Subsidiary [Member]
Debt Instrument [Line Items]
Repayments of long-term debt, Current			(3,000,000)
Repayments of long-term debt, Noncurrent			(3,000,000)
Repayments of long-term debt total			(6,000,000)
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	$ 111,300,000		125,900,000		$ 128,400,000
Scotiabank [Member] | Honduras Subsidiary [Member]
Debt Instrument [Line Items]
Repayments of long-term debt, Current			(600,000)
Repayments of long-term debt, Noncurrent			(850,000)
Repayments of long-term debt total			(1,450,000)
Citibank N.A. [Member] | Honduras Subsidiary [Member]
Debt Instrument [Line Items]
Repayments of long-term debt, Current			(1,850,000)
Repayments of long-term debt, Noncurrent			(6,063,000)
Repayments of long-term debt total			$ (7,913,000)

[1] 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.

[2] The carrying amount on non-cash assets assigned as collateral for these loans was $128.4 million. No cash assets were assigned as collateral for these loans.

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

[4] 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.