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ACQUISITION - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
9 Months Ended 10 Months Ended 12 Months Ended
Nov. 05, 2018
May 31, 2019
Aug. 31, 2019
Aug. 31, 2019
Aug. 31, 2018
Business Acquisition [Line Items]          
Acquired unfavorable contract backlog     $ (35,360) $ (35,360) $ 0
Inventory step up   $ 10,300      
Pension and other postretirement liabilities $ 6,400        
2018 Acquisitions          
Business Acquisition [Line Items]          
Cash and cash equivalents 6,399   6,399 6,399  
Accounts receivable 308,074   296,459 296,459  
Inventories 207,648   202,082 202,082  
Other current assets 11,788   26,290 26,290  
Property, plant and equipment 424,541   421,969 421,969  
Intangible assets 10,252   0 0  
Deferred income taxes 10,567   9,155 9,155  
Accounts payable-trade, accrued expenses and other payables (128,183)   (134,702) (134,702)  
Acquired unfavorable contract backlog (133,600)   (110,166) (110,166)  
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  
Measurement period adjustment, accounts receivable     (11,615)    
Measurement period adjustment, inventories     (5,566)    
Measurement period adjustment, other current assets     14,502    
Measurement period adjustment, property, plant and equipment     (2,572)    
Measurement period adjustment, intangible assets       $ (10,252)  
Measurement period adjustment, deferred income taxes     (1,412)    
Measurement period adjustment, accounts payable-trade, accrued expenses and other payables     (6,519)    
Measurement period adjustment, acquired unfavorable contract backlog     $ 23,434    
Minimum          
Business Acquisition [Line Items]          
Life in years, unfavorable contract backlog 1 year        
Minimum | Real Property          
Business Acquisition [Line Items]          
Estimated useful lives 1 year        
Minimum | Personal Property          
Business Acquisition [Line Items]          
Estimated useful lives 1 year        
Maximum          
Business Acquisition [Line Items]          
Life in years, unfavorable contract backlog 2 years        
Maximum | Real Property          
Business Acquisition [Line Items]          
Estimated useful lives 35 years        
Maximum | Personal Property          
Business Acquisition [Line Items]          
Estimated useful lives 25 years