Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net sales	$ 1,666.8	$ 1,371.5	$ 1,247.1
Cost of goods sold	1,136.6	949.7	860.9
Gross profit	530.2	421.8	386.2
Selling, general and administrative expenses	216.3	189.7	167.1
Amortization of intangible assets	26.6	19.7	51.2
Other operating income, net	0.0	0.0	(0.1)
Operating profit	287.3	212.4	168.0
Interest expense, net	66.9	49.2	43.2
Loss on extinguishment and refinancing of debt, net	0.0	17.6	1.6
Earnings before income taxes	220.4	145.6	123.2
Income tax expense	54.9	29.6	8.8
Net earnings including redeemable noncontrolling interest	165.5	116.0	114.4
Net earnings attributable to redeemable noncontrolling interest	0.0	33.7	86.8
Net earnings available to common stockholders	$ 165.5	$ 82.3	$ 27.6
Earnings per common share, basic (in usd per share)	$ 1.24	$ 0.88	$ 0.70
Earnings per common share, diluted (in usd per share)	$ 1.23	$ 0.88	$ 0.70
Weighted-Average common shares outstanding, basic (in shares)	133.0	93.5	39.5
Weighted-Average common shares outstanding, diluted (in shares)	134.1	93.8	39.7