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Income Tax Expense - Actual income tax expense from continuing operations (Details)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Expense
Federal corporate statutory rate	21.00%	21.00%	21.00%
State and local, net of Federal benefits	2.30%	2.50%	2.10%
Impact of foreign operations	1.10%	0.40%	0.30%
Federal research credit	(1.10%)	(0.80%)	(0.90%)
Executive compensation	0.90%	0.20%	1.10%
Valuation allowance	(0.10%)	(0.30%)	0.30%
U.S. tax on GILTI	2.50%	2.40%	1.30%
Foreign tax credits	(1.80%)	(2.00%)	(1.00%)
FDII deduction	(1.10%)	(1.70%)	(1.70%)
Other, net	0.20%	(0.10%)	(0.10%)
Effective income tax rate	23.90%	21.60%	22.40%

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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 GILTI.

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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 reported income tax benefit from difference to income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to foreign-derived intangible income (FDII).

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Percentage of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to global intangible low-taxed income (GILTI).

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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