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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2023
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign
The components of income before income taxes are presented below.
202320222021
 (in millions)
U.S.$83.2 $81.6 $94.0 
Non-U.S.25.8 17.0 0.9 
Income before income taxes$109.0 $98.6 $94.9 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The components of income tax expense are as follows:
202320222021
 (in millions)
Current:
U.S. federal$28.4 $19.5 $21.9 
U.S. state and local6.0 4.3 6.3 
Non-U.S.3.5 1.7 1.6 
Total current income tax expense37.9 25.5 29.8 
Deferred:
U.S. federal(11.2)(3.4)(4.7)
U.S. state and local(3.3)(0.9)(1.3)
Non-U.S.0.1 0.8 0.7 
Total deferred income tax benefit
(14.4)(3.5)(5.3)
Income tax expense$23.5 $22.0 $24.5 
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.

202320222021
(in millions)
Expense at U.S. federal statutory income tax rate$22.9 $20.7 $19.9 
Adjustments to reconcile to income tax expense:
State income taxes, net of federal benefit1.5 2.6 3.1 
Uncertain tax positions0.5 — 0.3 
Nondeductible compensation1.8 0.9 0.6 
Nondeductible expenses, other than compensation0.9 0.8 0.5 
Valuation allowances(0.6)1.0 (0.4)
Basis difference in foreign investment0.1 0.1 1.5 
Foreign income taxes(2.0)(1.5)(1.7)
Excess tax benefits related to stock compensation0.3 (0.1)(0.2)
Tax credits(3.5)(2.3)(1.6)
Other1.6 (0.2)2.5 
Income tax expense$23.5 $22.0 $24.5 
Schedule of Deferred Tax Assets and Liabilities
Deferred income tax balances are presented below.
 September 30,
 20232022
 (in millions)
Deferred income tax assets:
Accrued expenses$10.8 $10.5 
Lease liabilities6.4 8.1 
Inventories7.2 7.0 
State net operating losses1.9 2.1 
Net operating losses and credit carryovers16.2 12.9 
Stock-based compensation3.9 4.1 
Pension— 0.1 
Section 174 research and development capitalization
15.6 — 
Other4.4 2.3 
Total deferred income tax assets66.4 47.1 
Valuation allowance(15.1)(13.2)
Total deferred income tax assets, net of valuation allowance51.3 33.9 
Deferred income tax liabilities:
Intangible assets74.5 77.7 
Lease assets5.9 7.4 
Basis difference in foreign investment5.9 6.2 
Pension1.3 — 
Property, plant and equipment36.6 28.4 
Other0.9 0.5 
Total deferred income tax liabilities125.1 120.2 
Net deferred income tax liabilities$73.8 $86.3 
Schedule of Unrecognized Tax Benefits Roll Forward
The following table summarizes information concerning our gross unrecognized tax benefits.

20232022
 (in millions)
Balance at beginning of year$4.7 $4.8 
Increase related to current year positions1.0 0.7 
Decrease related to current year positions— (0.4)
Decrease as a result of statute of limitations lapse(0.6)(0.3)
Foreign currency exchange losses(0.1)(0.1)
Balance at end of year$5.0 $4.7