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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Tax at statutory rate   $ 156,827 $ 136,565 $ 149,730
Common stock dividends deductible for tax reporting   (1,419) (1,460) (1,745)
State taxes (net of federal benefit)   22,791 20,202 19,826
Amortization of excess deferred taxes   (16,125) (14,085) (1,219)
One-time income tax benefit   0 0 (158,782)
Remeasurement due to state deferred tax rate change   20,962 0 0
Other, net   4,241 (2,319) 270
Income tax expense (benefit)   $ 145,353 $ 138,903 $ 8,080
Statutory federal income tax rate 35.00% 21.00% 21.00% 24.50%