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Income Taxes
9 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block] Income Taxes The reconciliation between the U.S. federal statutory income tax rate and the effective income tax rate is presented below.
 Three months endedNine months ended
June 30,June 30,
2021202020212020
U.S. federal statutory income tax rate21.0 %21.0 %21.0 %21.0 %
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit4.2 4.5 4.2 4.5 
Excess tax (benefits) related to stock-based compensation— — (0.3)(0.6)
Tax credits(1.7)(1.7)(1.7)(2.6)
Global Intangible Low-Taxed Income0.5 (0.2)0.5 (0.1)
Foreign income tax rate differential(0.4)(0.5)(0.4)(0.6)
Nondeductible compensation0.6 1.0 0.6 0.6 
Basis difference in foreign investment1.2 0.3 1.2 — 
Valuation allowances— (0.3)0.7 (0.5)
Reversal of uncertain tax positions— (2.1)— (0.5)
Other2.6 1.3 0.5 1.5 
Effective income tax rate28.0 %23.3 %26.3 %22.7 %
At June 30, 2021 and September 30, 2020, the gross liabilities for uncertain tax positions were $5.0 million and $4.5 million, respectively,
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] The reconciliation between the U.S. federal statutory income tax rate and the effective income tax rate is presented below.
 Three months endedNine months ended
June 30,June 30,
2021202020212020
U.S. federal statutory income tax rate21.0 %21.0 %21.0 %21.0 %
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit4.2 4.5 4.2 4.5 
Excess tax (benefits) related to stock-based compensation— — (0.3)(0.6)
Tax credits(1.7)(1.7)(1.7)(2.6)
Global Intangible Low-Taxed Income0.5 (0.2)0.5 (0.1)
Foreign income tax rate differential(0.4)(0.5)(0.4)(0.6)
Nondeductible compensation0.6 1.0 0.6 0.6 
Basis difference in foreign investment1.2 0.3 1.2 — 
Valuation allowances— (0.3)0.7 (0.5)
Reversal of uncertain tax positions— (2.1)— (0.5)
Other2.6 1.3 0.5 1.5 
Effective income tax rate28.0 %23.3 %26.3 %22.7 %