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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2024
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The components of income before income taxes are presented below.
| 2024 |  | 2023 |  | 2022
| (in millions)
U.S. | $ | 176.1 |  |  | $ | 83.2 |  |  | $ | 81.6 |
Non-U.S. | (12.7) |  |  | 25.8 |  |  | 17.0 |
Income before income taxes | $ | 163.4 |  |  | $ | 109.0 |  |  | $ | 98.6 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of income tax expense are as follows:
| 2024 |  | 2023 |  | 2022
| (in millions)
Current: |  |  |  |  |
U.S. federal | $ | 53.4 |  |  | $ | 28.4 |  |  | $ | 19.5 |
U.S. state and local | 14.8 |  |  | 6.0 |  |  | 4.3 |
Non-U.S. | 0.8 |  |  | 3.5 |  |  | 1.7 |
Total current income tax expense | 69.0 |  |  | 37.9 |  |  | 25.5 |
Deferred: |  |  |  |  |
U.S. federal | (20.7) |  |  | (11.2) |  |  | (3.4) |
U.S. state and local | (1.1) |  |  | (3.3) |  |  | (0.9) |
Non-U.S. | 0.3 |  |  | 0.1 |  |  | 0.8 |
Total deferred income tax benefit | (21.5) |  |  | (14.4) |  |  | (3.5) |
Income tax expense | $ | 47.5 |  |  | $ | 23.5 |  |  | $ | 22.0 |
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.
| 2024 |  | 2023 |  | 2022
| (in millions)
Expense at U.S. federal statutory income tax rate | $ | 34.3 |  |  | $ | 22.9 |  |  | $ | 20.7 |
Adjustments to reconcile to income tax expense: |  |  |  |  |
State income taxes, net of federal benefit | 9.6 |  |  | 1.5 |  |  | 2.6 |
Uncertain tax positions | (2.3) |  |  | 0.5 |  |  | — |
Nondeductible compensation | 2.1 |  |  | 1.8 |  |  | 0.9 |
Nondeductible expenses, other than compensation | 0.6 |  |  | 0.9 |  |  | 0.8 |
Valuation allowances | 3.0 |  |  | (0.6) |  |  | 1.0 |
Basis difference in foreign investment | 0.1 |  |  | 0.1 |  |  | 0.1 |
Foreign income taxes | (0.8) |  |  | (2.0) |  |  | (1.5) |
Excess tax (benefit) deficit related to stock compensation | (0.6) |  |  | 0.3 |  |  | (0.1) |
Tax credits | (3.3) |  |  | (3.5) |  |  | (2.3) |
Goodwill impairment | 1.9 |  |  | — |  |  | — |
Other | 2.9 |  |  | 1.6 |  |  | (0.2) |
Income tax expense | $ | 47.5 |  |  | $ | 23.5 |  |  | $ | 22.0 |
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax balances are presented below.
| September 30,
| 2024 |  | 2023
| (in millions)
Deferred income tax assets: |  |  |
Accrued expenses | $ | 19.3 |  |  | $ | 10.8 |
Lease liabilities | 7.5 |  |  | 6.4 |
Inventories | 5.0 |  |  | 7.2 |
State net operating losses | 1.9 |  |  | 1.9 |
Net operating losses and credit carryovers | 15.9 |  |  | 16.2 |
Stock-based compensation | 4.3 |  |  | 3.9 |
Section 174 research and development capitalization | 23.1 |  |  | 15.6 |
Other | 5.3 |  |  | 4.4 |
Total deferred income tax assets | 82.3 |  |  | 66.4 |
Valuation allowance | (18.0) |  |  | (15.1) |
Total deferred income tax assets, net of valuation allowance | 64.3 |  |  | 51.3 |
Deferred income tax liabilities: |  |  |
Intangible assets | 68.2 |  |  | 74.5 |
Lease assets | 6.7 |  |  | 5.9 |
Basis difference in foreign investment | 6.0 |  |  | 5.9 |
Pension | 3.0 |  |  | 1.3 |
Property, plant and equipment | 34.7 |  |  | 36.6 |
Other | 1.1 |  |  | 0.9 |
Total deferred income tax liabilities | 119.7 |  |  | 125.1 |
Net deferred income tax liabilities | $ | 55.4 |  |  | $ | 73.8 |
Schedule of Unrecognized Tax Benefits Roll Forward | The following table summarizes information concerning our gross unrecognized tax benefits.
| 2024 |  | 2023
| (in millions)
Balance at beginning of year | $ | 5.0 |  |  | $ | 4.7 |
Increase related to current year positions | 0.8 |  |  | 1.0 |
Decrease as a result of statute of limitations lapse | (2.8) |  |  | (0.6) |
Foreign currency exchange losses | — |  |  | (0.1) |
Balance at end of year | $ | 3.0 |  |  | $ | 5.0 |

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