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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2022
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense (benefit)
Year Ended September 30,
202220212020
Current:
Federal$28.0 $9.2 $10.7 
State5.2 1.7 2.0 
Foreign0.4 (0.6)(0.2)
33.6 10.3 12.5 
Deferred:
Federal(3.4)(1.3)(2.0)
State(0.6)(0.2)(1.3)
Foreign— — — 
(4.0)(1.5)(3.3)
Income tax expense$29.6 $8.8 $9.2 
Schedule of effective income tax rate reconciliation
Year Ended September 30,
202220212020
Computed tax (21%)$30.6 $25.9 $23.0 
Income tax expense attributable to NCI(7.6)(19.5)(16.2)
State income taxes, net of effect on federal tax4.7 4.0 3.0 
Transaction costs2.0 — (1.2)
Uncertain tax position— — 1.5 
Other, net (none in excess of 5% of computed tax)(0.1)(1.6)(0.9)
Income tax expense$29.6 $8.8 $9.2 
Schedule of deferred tax assets and liabilities
September 30, 2022September 30, 2021
AssetsLiabilitiesNetAssetsLiabilitiesNet
Stock-based compensation awards$1.6 $— $1.6 $0.1 $— $0.1 
Accrued vacation, incentive and severance2.6 — 2.6 — — — 
Inventory4.1 — 4.1 — — — 
Accrued liabilities4.7 — 4.7 2.5 — 2.5 
ROU assets— (1.7)(1.7)— — — 
Lease liabilities1.7 — 1.7 — — — 
Property— (0.4)(0.4)— — — 
Intangible assets— (14.8)(14.8)1.0 — 1.0 
Investment in partnership (a)— — — — (11.2)(11.2)
Deferred income taxes$14.7 $(16.9)$(2.2)$3.6 $(11.2)$(7.6)
Summary of income tax contingencies
Year Ended September 30,
202220212020
Balance, beginning of year$1.5 $1.5 $— 
Additions for tax positions taken in current year— — 1.5 
Balance, end of year$1.5 $1.5 $1.5