Business Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 31, 2023	Jul. 01, 2023	Nov. 18, 2022	Aug. 31, 2022	Apr. 29, 2022	Oct. 01, 2021	Aug. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 229,419	$ 269,000		$ 255,198			$ 170,304
ScrapSource
Business Acquisition [Line Items]
Operating lease right-of-use assets			$ 466
Goodwill			13,105
Other intangible assets			11,955
Other assets			9
Total assets acquired			25,535
Operating lease liability			466
Total liabilities assumed			466
Net assets acquired			$ 25,069
Columbus Recycling
Business Acquisition [Line Items]
Cash						$ 325
Accounts receivable						22,763
Inventories						10,060
Other current assets						255
Property, plant and equipment						13,491
Operating lease right-of-use assets						254
Goodwill						65,203
Other intangible assets						19,741
Total assets acquired						132,092
Current liabilities						11,828
Other liabilities						3,350
Total liabilities assumed						15,178
Net assets acquired						$ 116,914
Encore Recycling
Business Acquisition [Line Items]
Accounts receivable					$ 10,356
Inventories					4,325
Other current assets					15
Property, plant and equipment					25,027
Operating lease right-of-use assets					402
Goodwill					21,423
Other intangible assets					4,809
Total assets acquired					66,357
Current liabilities					1,323
Other liabilities					1,091
Total liabilities assumed					2,414
Net assets acquired					$ 63,943