Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Aug. 31, 2024 USD ($) Jointventureinterest Segment shares	Aug. 31, 2023 USD ($) Jointventureinterest	Aug. 31, 2022 USD ($)
Significant Accounting Policies [Line Items]
Number of operating segments | Segment	1
Number of reportable segments | Segment	1
Bank Overdrafts	$ 59,000,000	$ 62,000,000
Allowance for Credit losses	2,000,000	2,000,000
Repayment of Advances with Scrap Metal	12,000,000	13,000,000	$ 11,000,000
Property, plant and equipment, net	672,192,000	706,805,000
Cash deposited into client trust account		7,000,000
Fair value of investment		1,000,000
Capitalized cloud computing arrangement implementation costs	7,000,000	5,000,000
Advances to supplier	18,000,000	11,000,000
Cash reserve deposit distributed	$ 7,000,000
Impairment in other loss, net		$ 5,000,000
Gain on Business Interruption Insurance Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration]		Cost of Goods and Services Sold	Cost of Goods and Services Sold
Impairment associated with previously capitalized cloud computing arrangement implementation costs		$ 5,000,000
Number of Equity Method Investments | Jointventureinterest	1	1
Cumulative Undistributed Earnings, Equity Method Joint Ventures	$ 8,000,000
Goodwill impairment charges	215,941,000	$ 39,270,000	$ 0
Advertising Expense	$ 6,000,000	5,000,000	6,000
Percentage likelihood of tax benefit being realized upon settlement with tax authority	50.00%
Cash, FDIC Insured Amount	$ 250,000
Operating Lease
Significant Accounting Policies [Line Items]
Property, plant and equipment, net	$ 14,000,000	14,000,000
Class A Common Stock
Significant Accounting Policies [Line Items]
Common Stock, Voting Rights	one
Number of shares each share of class B common stock convertible to class A common stock | shares	1
Number of shares of class A common stock reserved for each share of class B common stock | shares	1
Class B Common Stock
Significant Accounting Policies [Line Items]
Common Stock, Voting Rights	one
Prepaid Expenses and Other Current Assets
Significant Accounting Policies [Line Items]
Prepaid expense	$ 22,000,000	27,000,000
Prepaid Expenses and Other Current Assets | Certificates Of Deposit Member
Significant Accounting Policies [Line Items]
Short-term investment	6,000,000
Other Accrued Liabilities
Significant Accounting Policies [Line Items]
Workers' Compensation Liability	5,000,000	5,000,000
Other Current Assets
Significant Accounting Policies [Line Items]
Insurance receivable	15,000,000	14,000,000
Environmental claims insurance receivable	13,000,000	10,000,000
Workers' Compensation insurance receivables	$ 2,000,000	$ 2,000,000
Maximum
Significant Accounting Policies [Line Items]
Shipment Period	60 days
Short-term election non-cancellable lease term	12 months
Short-term election lease term renewal option	12 months
Fair value of investment	$ 1,000,000
Minimum
Significant Accounting Policies [Line Items]
Shipment Period	30 days
US Recycling
Significant Accounting Policies [Line Items]
Investment, Original Cost			6,000,000
Joint Venture Interests
Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
Premises At McMinnville
Significant Accounting Policies [Line Items]
Insurance recovery gain		$ 27,000,000	15,000,000
Premises At Everett
Significant Accounting Policies [Line Items]
Insurance recovery gain	$ 14,000,000	$ 16,000,000	$ 17,000,000