Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net sales	$ 1,996.2	$ 1,666.8	$ 1,371.5
Cost of goods sold	1,288.9	1,136.6	949.7
Gross profit	707.3	530.2	421.8
Selling, general and administrative expenses	284.6	216.3	189.7
Amortization of intangible assets	35.0	26.6	19.7
Operating profit	387.7	287.3	212.4
Interest expense, net	58.3	66.9	49.2
Loss on extinguishment of debt, net	0.0	0.0	17.6
Earnings before income taxes	329.4	220.4	145.6
Income tax expense	82.9	54.9	29.6
Net earnings including redeemable noncontrolling interest	246.5	165.5	116.0
Net earnings attributable to redeemable noncontrolling interest	0.0	0.0	33.7
Net earnings available to common stockholders	$ 246.5	$ 165.5	$ 82.3
Earnings per common share, basic (in usd per share)	$ 1.89	$ 1.24	$ 0.88
Earnings per common share, diluted (in usd per share)	$ 1.86	$ 1.23	$ 0.88
Weighted-Average common shares outstanding, basic (in shares)	130.3	133.0	93.5
Weighted-Average common shares outstanding, diluted (in shares)	132.3	134.1	93.8