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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Nov. 30, 2017	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017	Sep. 01, 2019
Goodwill impairment			$ 1,982
Goodwill		$ 64,138	64,310	$ 64,915
Reductions in operating cash flows		(367,521)	(670,457)	(616,017)
Increase (Decrease) in Accounts Receivable from Securitization, Investing Activities		(367,521)	(670,457)	(616,017)
Increases in investing cash flows		(462,048)	521,929	595,161
Net repayments (advances)		0	304,178	111,701
One reporting unit within Americas Fabrication
Goodwill		$ 51,100	$ 51,100
Receivables secured by credit insurance or letters of credit
Percentage of accounts receivable secured by credit insurance or letters of credit		13.00%	18.00%
Accounting Standards Update 2016-15
Reductions in operating cash flows		$ 367,500	$ 670,500
Increase (Decrease) in Accounts Receivable from Securitization, Investing Activities				$ (616,000)
Increases in investing cash flows		$ 367,500	$ 670,500
Net repayments (advances)	$ 90,000
Minimum | Accounting Standards Update 2016-02
Lease liability					$ 100,000
Right-of-use asset					100,000
Maximum | Accounting Standards Update 2016-02
Lease liability					120,000
Right-of-use asset					$ 120,000

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