Commitments and Contingencies - Recycling Operations - Recycling Operations (Details)	1 Months Ended				3 Months Ended	6 Months Ended
	Feb. 28, 2021 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2017 potentially_responsible_party	Jan. 31, 2017 USD ($)	May 31, 2020 USD ($)	Feb. 28, 2022 USD ($)	Aug. 31, 2021 USD ($)	Jan. 30, 2017 potentially_responsible_party party	Aug. 31, 2007 USD ($)
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies						$ 67,831,000	$ 77,128,000
Liabilities Established						6,986,000
Insurance receivable						0	10,000,000
Other Noncurrent Assets
Loss Contingencies [Line Items]
Insurance receivable						20,000,000	21,000,000
Portland Harbor Superfund Site
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies						5,000,000	$ 6,000,000
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
Site contingency expected completion term for remedial design		4 years
Site contingency EPA estimated completion cost for remedial design		$ 4,000,000
Liabilities Established					$ 3,000,000
Number Of Potentially Responsible Parties Joining Allocation Process | potentially_responsible_party								100
Parties named in Litigation | party								30
Portland Harbor Superfund Site | Other Noncurrent Assets
Loss Contingencies [Line Items]
Insurance receivable						$ 2,300,000
Portland Harbor Superfund Site | Minimum
Loss Contingencies [Line Items]
Insurance receivable	$ 3,000,000
Percentage of area require active clean up in remedial design phase	100.00%
Lower Willamette Group | Portland Harbor Superfund Site | Minimum
Loss Contingencies [Line Items]
Remedial Investigation and Feasibility Study Costs									$ 155,000,000
Potential Responsible Parties | Portland Harbor Superfund Site
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
Potential Responsible Parties | Portland Harbor Superfund Site | Minimum
Loss Contingencies [Line Items]
Estimated Cost of Selected Remedy, Range				50.00%
Potential Responsible Parties | Portland Harbor Superfund Site | Maximum
Loss Contingencies [Line Items]
Estimated Cost of Selected Remedy, Range				(30.00%)