ACQUISITION - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Feb. 28, 2019	Feb. 28, 2019	Nov. 05, 2018	Aug. 31, 2018
Business Acquisition [Line Items]
Acquired unfavorable contract backlog	$ (75,358)	$ (75,358)	$ (110,166)	$ 0
Inventory step up	10,300	10,300
Pension and other post-retirement liabilities			6,400
2018 Acquisitions
Business Acquisition [Line Items]
Cash and cash equivalents	6,399	6,399	6,399
Accounts receivable	301,740	301,740	308,074
Inventories	202,082	202,082	207,648
Other current assets	26,290	26,290	11,788
Property, plant and equipment	414,237	414,237	424,541
Intangible assets	0	0	10,252
Deferred income taxes	11,606	11,606	10,567
Accounts payable-trade, accrued expenses and other payables	(134,702)	(134,702)	(128,183)
Acquired unfavorable contract backlog	(110,166)	(110,166)	(133,600)
Other long-term liabilities	(9,920)	(9,920)	(9,920)
Pension and other post retirement employment benefits	(6,365)	(6,365)	(6,365)
Total assets acquired and liabilities assumed	701,201	$ 701,201	$ 701,201
Accounts receivable adjustment	(6,334)
Inventory adjustment	(5,566)
Other current assets adjustment	14,502
Property, plant and equipment adjustment	(10,304)
Intangible assets adjustment	(10,252)
Deferred income taxes adjustment	1,039
Accounts payable-trade, accrued expenses and other payables adjustment	(6,519)
Acquired unfavorable contract backlog adjustment	$ 23,434