Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net Sales	$ 2,316.6	$ 1,996.2	$ 1,666.8
Cost of goods sold	1,546.2	1,288.9	1,136.6
Gross profit	770.4	707.3	530.2
Selling, general and administrative expenses	396.0	284.6	216.3
Amortization of intangible assets	17.0	35.0	26.6
Operating profit	357.4	387.7	287.3
Interest expense, net	68.4	58.3	66.9
Earnings before income taxes	289.0	329.4	220.4
Income tax expense	72.8	82.9	54.9
Net Earnings	$ 216.2	$ 246.5	$ 165.5
Earnings per common share, basic (in usd per share)	$ 1.70	$ 1.89	$ 1.24
Earnings per common share, diluted (in usd per share)	$ 1.68	$ 1.86	$ 1.23
Weighted-Average common shares outstanding, basic (in shares)	126.9	130.3	133.0
Weighted-Average common shares outstanding, diluted (in shares)	128.5	132.3	134.1