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DEBT (Summary of Changes in Long-Term Debt) (Details) - USD ($)
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Debt Instrument [Line Items]      
Current portion of long-term debt $ 19,437,000 $ 25,875,000  
Long-term debt (net of current portion) 112,610,000 63,711,000  
Total [1] 132,047,000 [2] 89,586,000  
Proceeds from long-term debt incurred during the period 17,565,000 57,882,000  
Regularly scheduled loan payments, Current portion of long-term debt (5,168,000) (5,393,000)  
Regularly scheduled loan payments, Long-term debt (net of current portion) (14,825,000) (9,771,000)  
Regularly scheduled loan payments total [1] (19,993,000) (15,164,000)  
Refinances of short-term debt, Current portion of long-term debt   (11,046,000)  
Refinances of short-term debt, Long-term debt (net of current portion)   11,046,000  
Refinances of short-term debt [1]    
Reclassification of long-term debt due in the next 12 months, Current portion of long-term debt 2,368,000 3,875,000  
Reclassification of long-term debt due in the next 12 months, Long-term debt (net of current portion) (2,368,000) (3,875,000)  
Reclassification of long-term debt due in the next 12 months total [1]  
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar, Current portion of long-term debt [3] 22,000 64,000  
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar, Long-term debt (net of current portion) [3] (136,000) (321,000)  
Translation adjustments on foreign currency debt of subsidiaries whose functional currency is not the U.S. dollar total [1],[3] (114,000) (257,000)  
Current portion of long-term debt 19,395,000 19,437,000  
Long-term debt (net of current portion) 110,110,000 112,610,000  
Total [1] 129,505,000 [4] 132,047,000 [2]  
Colombia Subsidiary [Member]      
Debt Instrument [Line Items]      
Proceeds from long-term debt incurred during the period, Long-term debt (net of current portion)   25,000,000  
Proceeds from long-term debt incurred during the period [1]   25,000,000  
Guatemala Subsidiary [Member]      
Debt Instrument [Line Items]      
Proceeds from long-term debt incurred during the period, Long-term debt (net of current portion)   20,820,000  
Proceeds from long-term debt incurred during the period [1]   20,820,000  
Trinidad Subsidiary [Member]      
Debt Instrument [Line Items]      
Proceeds from long-term debt incurred during the period, Current portion of long-term debt 2,736,000 6,062,000  
Proceeds from long-term debt incurred during the period, Long-term debt (net of current portion) 14,829,000 6,000,000  
Proceeds from long-term debt incurred during the period [1] 17,565,000 12,062,000  
Cash Asset [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Collateral amount 7,000,000.0 0 $ 0
NonCash Asset [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Collateral amount $ 153,500,000 $ 158,600,000 $ 111,300,000
[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 $158.6 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 $153.5 million. The carrying amount on cash assets assigned as collateral for these loans was $7.0 million.