Commitments and Contingencies - Recycling Operations - Recycling Operations (Details) $ in Thousands		1 Months Ended		3 Months Ended			12 Months Ended
	May 04, 2020 USD ($)	Dec. 31, 2017 potentially_responsible_party	Jan. 31, 2017 USD ($)	Nov. 30, 2020 USD ($)	May 31, 2020 USD ($)	Nov. 30, 2019 Subarea	Aug. 31, 2018 USD ($)	Aug. 31, 2007 USD ($)	Aug. 31, 2020 USD ($)	Jan. 30, 2017 potentially_responsible_party party	Aug. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies				$ 54,725					$ 53,464
Parties named in Litigation | party										30
Liabilities Established				2,347
Other Auto and Metals Recycling Sites
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies				55,000					53,000
Portland Harbor Superfund Site
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies				$ 6,000					$ 4,000
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		$ 2,000
Insurance Receivable							$ 2,000
Site contingency expected completion term for remedial design	4 years
Site contingency EPA estimated completion cost for remedial design	$ 4,000
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
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
Estimated Cost of Selected Remedy Discounted			$ 1,050,000
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
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
Estimated Cost of Selected Remedy, Range			50.00%