Revenue - Summary of Revenues Disaggregated by Major Product and Sales Destination (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 673,920	$ 809,610	$ 1,967,876	$ 2,164,293
Ferrous Revenues
Disaggregation of Revenue [Line Items]
Revenues	334,425	405,350	999,419	1,101,201
Nonferrous Revenues
Disaggregation of Revenue [Line Items]
Revenues	184,127	222,904	517,902	580,234
Steel Revenues
Disaggregation of Revenue [Line Items]
Revenues	108,259	137,426	322,511	369,766
Retail and Other Revenues
Disaggregation of Revenue [Line Items]
Revenues	47,109	43,930	128,044	113,092
Foreign
Disaggregation of Revenue [Line Items]
Revenues	348,503	413,815	1,023,799	1,122,718
Domestic
Disaggregation of Revenue [Line Items]
Revenues	$ 325,417	$ 395,795	$ 944,077	$ 1,041,575