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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2023
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense (benefit)
Year Ended September 30,
202320222021
Current:
Federal$49.1 $28.0 $9.2 
State10.9 5.2 1.7 
Foreign0.9 0.4 (0.6)
60.9 33.6 10.3 
Deferred:
Federal(4.9)(3.4)(1.3)
State(1.1)(0.6)(0.2)
Foreign— — — 
(6.0)(4.0)(1.5)
Income tax expense$54.9 $29.6 $8.8 
Schedule of effective income tax rate reconciliation
Year Ended September 30,
202320222021
Computed tax at federal statutory rate (21%)
$46.3 $30.6 $25.9 
Income tax expense attributable to NCI— (7.6)(19.5)
State income taxes, net of effect on federal tax8.4 4.7 4.0 
Transaction costs— 2.0 — 
Other, net (none in excess of 5% of computed tax)0.2 (0.1)(1.6)
Income tax expense$54.9 $29.6 $8.8 
Schedule of deferred tax assets and liabilities
September 30, 2023September 30, 2022
AssetsLiabilitiesNetAssetsLiabilitiesNet
Stock-based compensation awards$2.2 $— $2.2 $1.6 $— $1.6 
Accrued vacation, incentive and severance3.1 — 3.1 2.6 — 2.6 
Inventory4.4 — 4.4 4.1 — 4.1 
Accrued liabilities6.0 — 6.0 4.7 — 4.7 
ROU assets— (1.4)(1.4)— (1.7)(1.7)
Lease liabilities1.4 — 1.4 1.7 — 1.7 
Property— (0.3)(0.3)— (0.4)(0.4)
Intangible assets— (13.9)(13.9)— (14.8)(14.8)
Capitalized research and development
2.3 — 2.3 — — — 
Total deferred income taxes
$19.4 $(15.6)$3.8 $14.7 $(16.9)$(2.2)