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Commitments and Contingencies - Recycling Operations and Other Legacy (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 04, 2020
USD ($)
Dec. 31, 2017
potentially_responsible_party
Jan. 31, 2017
USD ($)
May 31, 2020
USD ($)
May 31, 2020
USD ($)
Subarea
Aug. 31, 2018
USD ($)
Aug. 31, 2007
USD ($)
Aug. 31, 2019
USD ($)
Jan. 30, 2017
potentially_responsible_party
party
Aug. 31, 2016
USD ($)
Loss Contingencies [Line Items]                    
Accrual for Environmental Loss Contingencies       $ 54,010,000 $ 54,010,000     $ 51,799,000    
Parties named in Litigation | party                 30  
Liabilities Established         5,462,000          
Insurance Receivable       5,000,000 5,000,000     89,000,000    
Other Auto and Metals Recycling Business Sites                    
Loss Contingencies [Line Items]                    
Accrual for Environmental Loss Contingencies       54,000,000 $ 54,000,000     52,000,000    
Portland Harbor Superfund Site                    
Loss Contingencies [Line Items]                    
Number Of Potentially Responsible Parties Joining Allocation Process | potentially_responsible_party                 100  
Number Of Other Potentially Responsible Parties Signing Settlement Agreement and Order on Consent | potentially_responsible_party   3                
Number of Years for Pre-Remedial Design   2 years                
Liabilities Established       3,000,000   $ 2,000,000        
Insurance Receivable           2,000,000        
Site contingency expected completion term for remedial design 4 years                  
Site contingency EPA estimated completion cost for remedial design $ 4,000,000                  
Portland Harbor Superfund Site | Minimum                    
Loss Contingencies [Line Items]                    
Site contingency proposed subareas for remedial design | Subarea         8          
Portland Harbor Superfund Site | Maximum                    
Loss Contingencies [Line Items]                    
Site contingency proposed subareas for remedial design | Subarea         10          
Portland Harbor Superfund Site | Lower Willamette Group                    
Loss Contingencies [Line Items]                    
Remedial Investigation and Feasibility Study Costs             $ 155,000,000      
Number of Years for Remedial Investigation and Feasibility Study             18 years      
Portland Harbor Superfund Site | Potential Responsible Parties                    
Loss Contingencies [Line Items]                    
Estimated Cost of Selected Remedy Undiscounted     $ 1,700,000,000              
Estimated Cost of Selected Remedy Discounted     $ 1,050,000,000.00              
Estimated Cost of Selected Remedy, Discount Rate     7.00%              
Site Contingency, Estimated Construction Time Frame     13 years              
Portland Harbor Superfund Site | Potential Responsible Parties | Minimum                    
Loss Contingencies [Line Items]                    
Site Contingency, Least Costly Remediation Plan Discounted                   $ 170,000,000
Estimated Cost of Selected Remedy, Range     (30.00%)              
Portland Harbor Superfund Site | Potential Responsible Parties | Maximum                    
Loss Contingencies [Line Items]                    
Site Contingency, Most Costly Remediation Plan Discounted                   $ 2,500,000,000
Estimated Cost of Selected Remedy, Range     50.00%              
Legacy Environmental Site 1 - Remediation of Shredder Residue                    
Loss Contingencies [Line Items]                    
Accrual for Environmental Loss Contingencies       4,000,000 $ 4,000,000     4,000,000    
Environmental remediation expense accrued in the period           $ 4,000,000        
Legacy Environmental Site 1 - Remediation of Shredder Residue | Minimum                    
Loss Contingencies [Line Items]                    
Loss contingency, range of possible loss       0 0          
Legacy Environmental Site 1 - Remediation of Shredder Residue | Maximum                    
Loss Contingencies [Line Items]                    
Loss contingency, range of possible loss       28,000,000 28,000,000          
Legacy Environmental Site 2 - Remediation of Soil and Groundwater Conditions                    
Loss Contingencies [Line Items]                    
Accrual for Environmental Loss Contingencies       $ 7,000,000 7,000,000     $ 8,000,000    
Legacy Environmental Site 2 - Installation of Wellhead Treatment | Minimum                    
Loss Contingencies [Line Items]                    
Environmental remediation expense accrued in the period         10,000,000          
Legacy Environmental Site 2 - Installation of Wellhead Treatment | Maximum                    
Loss Contingencies [Line Items]                    
Environmental remediation expense accrued in the period         $ 13,000,000