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INCOME TAX (Reconciliation of Federal Statutory Rate to Effective Tax Rate from Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Income Tax Contingency [Line Items]
Federal statutory tax rate (percent)	21.00%	21.00%	25.70%
Income tax expense at statutory rate	$ 77,863	$ 56,377	$ 42,471
State and local taxes	9,895	6,085	2,317
Foreign tax impairment on valuation of subsidiaries	5,084	(29,697)	22,315
Foreign rate differential	(1,346)	(1,466)	(5,973)
Research and experimentation benefits	1,085	580	4,707
Change in valuation allowance	968	36,167	(20,839)
Nontaxable foreign interest	8	(9,799)	(17,414)
TCJA - Toll charge and related foreign tax credits	0	7,410	29,466
TCJA - Remeasurement of deferred tax balances	0	(586)	(25,515)
Audit settlement	0	120	(3,187)
Gain on international restructure	0	0	18,926
Worthless stock deduction	0	0	(6,084)
Other	1,089	5,650	(1,629)
Income tax expense on continuing operations	$ 92,476	$ 69,681	$ 30,147
Effective income tax rate from continuing operations	24.90%	26.00%	18.20%
Poland
Income Tax Contingency [Line Items]
Federal statutory tax rate (percent)	19.00%

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