Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net earnings	$ 216.2	$ 246.5	$ 165.5
Foreign currency translation adjustments:
Unrealized foreign currency translation adjustments	1.0	1.1	1.2
Other Comprehensive Income	1.0	1.1	1.2
Total Comprehensive Income	$ 217.2	$ 247.6	$ 166.7