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Income Taxes - Schedule of Reconciliation of Income Tax Computed at U.S. Federal Statutory Tax Rates to Income Tax Expense (Details)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Effective Rate Reconciliation
U.S. federal tax rate	21.00%	21.00%	21.00%
State income taxes, net	2.20%	2.80%	2.50%
Foreign taxes	1.70%	0.80%	(0.20%)
Tax audit settlements	(1.00%)	0.00%	0.00%
Valuation allowance	(1.30%)	3.30%	(0.10%)
Domestic tax credits	(2.50%)	(3.20%)	(1.00%)
Foreign-derived intangible income deduction	0.00%	(0.40%)	(1.00%)
Mandatory repatriation tax - U.S. Tax Reform	0.00%	0.00%	0.70%
CARES Act net operating loss carryback	(15.10%)	0.00%	0.00%
Other, net	0.10%	1.40%	0.90%
Effective income tax rate	5.10%	25.70%	22.80%

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Effective income tax rate reconciliation CARES Act net operating loss carryback.

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Effective income tax rate reconciliation deductions foreign derived intangible income.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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