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Income Taxes (Tables)
12 Months Ended
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.
202420232022
 (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:
202420232022
 (in millions)
Current:
U.S. federal$53.4 $28.4 $19.5 
U.S. state and local14.8 6.0 4.3 
Non-U.S.0.8 3.5 1.7 
Total current income tax expense69.0 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.

202420232022
(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 benefit9.6 1.5 2.6 
Uncertain tax positions(2.3)0.5 — 
Nondeductible compensation2.1 1.8 0.9 
Nondeductible expenses, other than compensation0.6 0.9 0.8 
Valuation allowances3.0 (0.6)1.0 
Basis difference in foreign investment0.1 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 impairment1.9 — — 
Other2.9 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,
 20242023
 (in millions)
Deferred income tax assets:
Accrued expenses$19.3 $10.8 
Lease liabilities7.5 6.4 
Inventories5.0 7.2 
State net operating losses1.9 1.9 
Net operating losses and credit carryovers15.9 16.2 
Stock-based compensation4.3 3.9 
Section 174 research and development capitalization
23.1 15.6 
Other5.3 4.4 
Total deferred income tax assets82.3 66.4 
Valuation allowance(18.0)(15.1)
Total deferred income tax assets, net of valuation allowance64.3 51.3 
Deferred income tax liabilities:
Intangible assets68.2 74.5 
Lease assets6.7 5.9 
Basis difference in foreign investment6.0 5.9 
Pension3.0 1.3 
Property, plant and equipment34.7 36.6 
Other1.1 0.9 
Total deferred income tax liabilities119.7 125.1 
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.

20242023
 (in millions)
Balance at beginning of year$5.0 $4.7 
Increase related to current year positions0.8 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