DEBT (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
		Aug. 31, 2022		Aug. 31, 2021		Aug. 31, 2020
Debt Instrument [Line Items]
Total long-term loans	[2]	$ 137,271	[1]	$ 129,505	[3]	$ 132,047
Annual commitment fee		0.25%
Uncommitted [Member]
Debt Instrument [Line Items]
Credit facility current borrowing capacity		$ 91,000		91,000
Committed [Member]
Debt Instrument [Line Items]
Credit facility current borrowing capacity		75,000		40,000
Group of Subsidiaries [Member] | Debt With Covenants [Member]
Debt Instrument [Line Items]
Total long-term loans		110,700		$ 103,400
Trinidad Subsidiary [Member]
Debt Instrument [Line Items]
Increase in long term debt		$ 25,000
Trinidad Subsidiary [Member] | Long-Term Loan [Member]
Debt Instrument [Line Items]
Debt term		4 years

[1] The carrying amount on non-cash assets assigned as collateral for these loans was $155.6 million. The carrying amount on cash assets assigned as collateral for these loans was $5.3 million.

[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] 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.