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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2020
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense (benefit)
Year Ended September 30,
202020192018
Current:
Federal$10.7 $33.6 $29.4 
State2.0 5.0 2.6 
Foreign(0.2)0.3 0.3 
12.5 38.9 32.3 
Deferred:
Federal(2.0)0.2 (9.1)
State(1.3)0.3 0.5 
Foreign— — — 
(3.3)0.5 (8.6)
Income tax expense$9.2 $39.4 $23.7 
Schedule of effective income tax rate reconciliation
Year Ended September 30,
202020192018
Computed tax (a)$23.0 $34.1 $29.4 
Enacted tax law and changes, including the Tax Act (a)— — (9.4)
Net earnings attributable to NCI(16.2)— — 
State income taxes, net of effect on federal tax3.0 4.9 3.3 
Tax-deductible transaction costs(1.2)— — 
Uncertain tax position1.5 — — 
Other, net (none in excess of 5% of computed tax)(0.9)0.4 0.4 
Income tax expense$9.2 $39.4 $23.7 
Schedule of deferred tax assets and liabilities
September 30, 2020September 30, 2019
AssetsLiabilitiesNetAssetsLiabilitiesNet
Accrued vacation, incentive and severance$— $— $— $2.1 $— $2.1 
Stock-based compensation awards— — — 0.8 — 0.8 
Inventory— — — 3.1 — 3.1 
Accrued liabilities2.6 — 2.6 2.2 — 2.2 
Intangible assets1.0 — 1.0 — (21.9)(21.9)
Property— — — — (0.4)(0.4)
Investment in partnership (a)— (12.6)(12.6)— — — 
Deferred income taxes$3.6 $(12.6)$(9.0)$8.2 $(22.3)$(14.1)
Summary of income tax contingencies
Year Ended September 30,
202020192018
Balance, beginning of year$— $0.5 $— 
Additions for tax positions taken in current year and acquisitions1.5 — 0.5 
Reductions for tax positions taken in prior years— (0.5)— 
Balance, end of year$1.5 $— $0.5