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Income Taxes Income Tax Rate Reconciliation (Details)
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Adjustments to reconcile to the effective tax rate:    
State income taxes, net of federal benefit 4.50% 4.50%
Valuation allowance adjustment related to stock compensation 1.50% (0.70%)
Tax benefits from stock compensation (0.60%) (1.50%)
Tax credits (1.40%) (1.10%)
Effective Income Tax Rate Reconciliation, GILTI, percent 0.60% 0.10%
Other 1.10% 1.50%
Walter Energy accrual 0.00% (0.30%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent (0.90%) (0.70%)