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BUSINESS SEGMENTS (Reconciliations of Earnings from Continuing Operations to Adjusted Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Segment Reporting [Abstract]
Earnings from continuing operations	$ 130,408	$ 64,169	$ 260,552	$ 210,520
Interest expense	11,965	15,409	40,245	47,875
Income taxes	38,175	23,804	80,709	73,981
Depreciation and amortization	41,804	41,765	125,176	124,095
Amortization of acquired unfavorable contract backlog	(1,508)	(4,348)	(4,540)	(18,676)
Asset impairments	277	5,983
Adjusted EBITDA	$ 221,121	$ 146,782	$ 506,487	$ 444,308

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