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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]      
Revenues $ 1,662.4 $ 1,509.4 $ 1,436.9
Cost of sales 1,298.9 1,150.1 1,132.8
Selling, general and administrative expense 154.4 118.5 97.7
Equity in earnings of unconsolidated ventures (0.6) 0.0 0.0
Gain on sale of assets (4.5) (9.5) (1.6)
Interest and other income (6.3) (19.8) (13.6)
Loss on extinguishment of debt 1.2 0.0 0.0
Income before income taxes 219.3 270.1 221.6
Income tax expense 51.4 66.7 54.7
Net income $ 167.9 $ 203.4 $ 166.9
Basic net income per common share $ 3.30 $ 4.03 $ 3.34
Weighted average number of common shares 50,872,335 50,426,040 49,986,526
Diluted net income per common share $ 3.29 $ 4.00 $ 3.33
Adjusted weighted average number of common shares 51,059,852 50,793,954 50,124,113