CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share, Diluted [Abstract]
Revenues	$ 305.9	$ 216.7
Cost of sales	233.0	169.2
Selling, General and Administrative Expense	28.0	22.9
Gain on sale of assets	0.0	(1.6)
Interest and other income	(6.3)	(1.7)
Income before income taxes	51.2	27.9
Income tax expense	13.0	7.1
Net income	$ 38.2	$ 20.8
Basic net income per common share	$ 0.76	$ 0.42
Weighted average number of common shares	50,065,832	49,890,481
Diluted net income per common share	$ 0.76	$ 0.42
Adjusted weighted average number of common shares	50,462,082	49,899,022