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CHANGES IN BUSINESS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2020
Aug. 31, 2018
Nov. 05, 2019
Aug. 31, 2019
Nov. 05, 2018
Business Acquisition [Line Items]          
Acquired unfavorable contract backlog $ (6,035)     $ (35,360) $ (110,200)
Settlement of working capital adjustment $ 32,100 $ 51,700      
2019 Acquisitions          
Business Acquisition [Line Items]          
Cash and cash equivalents     $ 6,399    
Accounts receivable     296,459    
Inventories     202,082    
Other current assets     26,290    
Property, plant and equipment     421,969    
Deferred income taxes     9,155    
Accounts payable-trade, accrued expenses and other payables     (134,702)    
Acquired unfavorable contract backlog     (110,166)    
Other long-term liabilities     (9,920)    
Pension and other post retirement employment benefits     (6,365)    
Total assets acquired and liabilities assumed     $ 701,201