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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

The components of income before income taxes are presented below:

			2025						2024						2023
			(in millions)
U.S.			$	248.2					$	176.1					$	83.2
Non-U.S.			6.0						(12.7)						25.8
Income before income taxes			$	254.2					$	163.4					$	109.0

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The components of income tax expense are as follows:

			2025						2024						2023
			(in millions)
Current:
U.S. federal			$	56.0					$	53.4					$	28.4
U.S. state and local			11.7						14.8						6.0
Non-U.S.			1.8						0.8						3.5
Total current income tax expense			69.5						69.0						37.9
Deferred:
U.S. federal			(5.2)						(20.7)						(11.2)
U.S. state and local			(0.5)						(1.1)						(3.3)
Non-U.S.			(1.3)						0.3						0.1
Total deferred income tax benefit			(7.0)						(21.5)						(14.4)
Income tax expense			$	62.5					$	47.5					$	23.5

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The reconciliation between income tax expense at the United States federal statutory income tax rate and reported income tax expense is presented below:

			2025						2024						2023
			(in millions)
Expense at U.S. federal statutory income tax rate			$	53.4					$	34.3					$	22.9
Adjustments to reconcile to income tax expense:
State income taxes, net of federal benefit			9.0						9.6						1.5
Uncertain tax positions			0.2						(2.3)						0.5
Nondeductible compensation			4.0						2.1						1.8
Nondeductible expenses, other than compensation			0.7						0.6						0.9
Valuation allowances			0.3						3.0						(0.6)
Basis difference in foreign investment			—						0.1						0.1
Foreign income taxes			(1.6)						(0.8)						(2.0)
Excess tax (benefit) deficit related to stock compensation			(2.0)						(0.6)						0.3
Tax credits			(2.9)						(3.3)						(3.5)
Goodwill impairment			—						1.9						—
Other			1.4						2.9						1.6
Income tax expense			$	62.5					$	47.5					$	23.5

Schedule of Deferred Tax Assets and Liabilities

Deferred income tax balances are presented below:

			September 30,
			2025						2024
			(in millions)
Deferred income tax assets:
Accrued expenses			$	18.0					$	19.3
Lease liabilities			9.1						7.5
Inventories			7.9						5.0
State net operating losses			1.4						1.9
Net operating losses and credit carryovers			16.7						15.9
Stock-based compensation			4.8						4.3
Section 174 research and development capitalization			30.4						23.1
Other			3.0						5.3
Total deferred income tax assets			91.3						82.3
Valuation allowance			(18.0)						(18.0)
Total deferred income tax assets, net of valuation allowance			73.3						64.3
Deferred income tax liabilities:
Intangible assets			67.4						68.2
Lease assets			7.9						6.7
Basis difference in foreign investment			7.0						6.0
Pension			4.5						3.0
Property, plant and equipment			36.4						34.7
Other			1.1						1.1
Total deferred income tax liabilities			124.3						119.7
Net deferred income tax liabilities			$	51.0					$	55.4

Schedule of Unrecognized Tax Benefits Roll Forward

The following table summarizes information concerning our gross unrecognized tax benefits:

			2025						2024
			(in millions)
Balance at beginning of year			$	3.0					$	5.0
Increase related to current year positions			0.8						0.8
Decrease as a result of statute of limitations lapse			(0.6)						(2.8)
Balance at end of year			$	3.2					$	3.0

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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