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Income Taxes - Deferreds (Details) - Noncurrent - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Deferred tax assets |  |
Income Tax Disclosure |  |
Deferred tax assets, accrued liabilities | $ 26.4 | $ 6.7
Deferred tax assets, employee compensation | 4.1 | 5.0
Deferred Tax Assets, Capitalized research and development | 8.6 | 4.7
Deferred tax assets, inventory | 4.5 | 4.2
Deferred tax assets, share-based compensation cost | 2.3 | 3.0
Deferred Tax Liabilities, Leasing Arrangements | 6.0 | 1.0
Deferred tax assets (liabilities), intangible assets | 0.0 | 0.0
Deferred Tax Assets, Leasing Arrangements | 0.0 | 0.0
Deferred tax liabilities, property, plant and equipment | 0.0 | 0.0
Deferred Tax Assets, Other | 0.0 | 0.0
Deferred tax assets, net | 51.9 | 24.6
Deferred tax liability |  |
Income Tax Disclosure |  |
Deferred tax assets, accrued liabilities | 0.0 | 0.0
Deferred tax assets, employee compensation | 0.0 | 0.0
Deferred Tax Assets, Capitalized research and development | 0.0 | 0.0
Deferred tax assets, inventory | 0.0 | 0.0
Deferred tax assets, share-based compensation cost | 0.0 | 0.0
Deferred Tax Liabilities, Leasing Arrangements | 0.0 | 0.0
Deferred tax assets (liabilities), intangible assets | (13.1) | (10.9)
Deferred Tax Assets, Leasing Arrangements | (6.0) | (1.0)
Deferred tax liabilities, property, plant and equipment | (0.4) | (0.2)
Deferred tax liabilities, other | (0.4) | 0.0
Deferred tax liabilities, net | (19.9) | (12.1)
Total deferred income taxes |  |
Income Tax Disclosure |  |
Deferred tax assets, accrued liabilities | 26.4 | 6.7
Deferred tax assets, employee compensation | 4.1 | 5.0
Deferred Tax Assets, Capitalized research and development | 8.6 | 4.7
Deferred tax assets, inventory | 4.5 | 4.2
Deferred tax assets, share-based compensation cost | 2.3 | 3.0
Deferred Tax Liabilities, Leasing Arrangements | 6.0 | 1.0
Deferred tax assets (liabilities), intangible assets | (13.1) | (10.9)
Deferred Tax Assets, Leasing Arrangements | (6.0) | (1.0)
Deferred tax liabilities, property, plant and equipment | (0.4) | (0.2)
Deferred Tax Assets, Other | (0.4) | 0.0
Deferred tax assets, net | $ 32.0 | $ 12.5

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