Revenue - Summary of Revenues Disaggregated by Major Product and Sales Destination (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 621,059	$ 755,953	$ 1,293,956	$ 1,354,683
Ferrous Revenues
Disaggregation of Revenue [Line Items]
Revenues	316,097	434,122	664,994	695,851
Nonferrous Revenues
Disaggregation of Revenue [Line Items]
Revenues	164,481	179,655	333,775	357,330
Steel Revenues
Disaggregation of Revenue [Line Items]
Revenues	100,721	107,825	214,252	232,340
Retail and Other Revenues
Disaggregation of Revenue [Line Items]
Revenues	39,760	34,351	80,935	69,162
Foreign
Disaggregation of Revenue [Line Items]
Revenues	328,259	436,219	686,280	708,903
Domestic
Disaggregation of Revenue [Line Items]
Revenues	$ 292,800	$ 319,734	$ 607,676	$ 645,780