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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]      
Revenues $ 1,509.4 $ 1,436.9 $ 1,519.1
Cost of sales 1,150.1 1,132.8 1,195.1
Selling, general and administrative expense 118.5 97.7 93.6
Equity in earnings of unconsolidated ventures 0.0 0.0 (1.2)
Gain on sale of assets (9.5) (1.6) (3.2)
Interest and other income (19.8) (13.6) (1.0)
Income before income taxes 270.1 221.6 235.8
Income tax expense 66.7 54.7 57.0
Net income $ 203.4 $ 166.9 $ 178.8
Basic net income per common share $ 4.03 $ 3.34 $ 3.59
Weighted average number of common shares 50,426,040 49,986,526 49,818,132
Diluted net income per common share $ 4.00 $ 3.33 $ 3.59
Adjusted weighted average number of common shares 50,793,954 50,124,113 49,849,894