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GOODWILL AND OTHER INTANGIBLES (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Aug. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]          
Gross carrying amounts of the intangible assets subject to amortization $ 21,900   $ 21,900   $ 22,100
Net carrying amount of intangible assets subject to amortization 11,000   11,000   12,600
Carrying amount of acquired unfavorable contract backlog liability 1,500   1,500   $ 6,000
Amortization of unfavorable contract backlog $ 1,500 $ 4,400 $ 4,500 $ 18,700