Income Taxes - Deferreds (Details) - Noncurrent - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Deferred tax assets
Income Tax Disclosure
Deferred tax assets, share-based compensation cost	$ 2.2	$ 1.6
Deferred tax assets, employee compensation	3.1	2.6
Deferred tax assets, inventory	4.4	4.1
Deferred tax assets, accrued liabilities	6.0	4.7
Deferred Tax Assets, Leasing Arrangements	0.0	0.0
Deferred Tax Liabilities, Leasing Arrangements	1.4	1.7
Deferred tax liabilities, property, plant and equipment	0.0	0.0
Deferred tax assets (liabilities), intangible assets	0.0	0.0
Deferred Tax Assets, Capitalized research and development	2.3	0.0
Deferred tax assets, net	19.4	14.7
Deferred tax liability
Income Tax Disclosure
Deferred tax assets, share-based compensation cost	0.0	0.0
Deferred tax assets, employee compensation	0.0	0.0
Deferred tax assets, inventory	0.0	0.0
Deferred tax assets, accrued liabilities	0.0	0.0
Deferred Tax Assets, Leasing Arrangements	(1.4)	(1.7)
Deferred Tax Liabilities, Leasing Arrangements	0.0	0.0
Deferred tax liabilities, property, plant and equipment	(0.3)	(0.4)
Deferred tax assets (liabilities), intangible assets	(13.9)	(14.8)
Deferred Tax Assets, Capitalized research and development	0.0	0.0
Deferred tax liabilities, net	(15.6)	(16.9)
Total deferred income taxes
Income Tax Disclosure
Deferred tax assets, share-based compensation cost	2.2	1.6
Deferred tax assets, employee compensation	3.1	2.6
Deferred tax assets, inventory	4.4	4.1
Deferred tax assets, accrued liabilities	6.0	4.7
Deferred Tax Assets, Leasing Arrangements	(1.4)	(1.7)
Deferred Tax Liabilities, Leasing Arrangements	1.4	1.7
Deferred tax liabilities, property, plant and equipment	(0.3)	(0.4)
Deferred tax assets (liabilities), intangible assets	(13.9)	(14.8)
Deferred Tax Assets, Capitalized research and development	2.3	0.0
Deferred tax assets, net	$ 3.8
Deferred tax liabilities, net		$ (2.2)