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Income Taxes (Reconciliation of U.S Statutory Rate to Effective Tax Rate) (Details)			12 Months Ended				33 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	35.00%	21.00%	21.00%	24.50%	35.00%	21.00%
State income taxes, net of federal tax benefit			0.30%	(0.10%)	(0.50%)
Taxes on international activities			(2.10%)	0.20%	(1.80%)
Research credit			(3.60%)	(3.30%)	(4.80%)
Net excess income tax benefit from stock-based compensation			(2.80%)	(3.50%)	(1.40%)
Domestic production activities deduction					(1.60%)
Adjustments of prior period tax items			1.00%	0.90%	(5.00%)
Effect of U.S. federal corporate rate reduction on net beginning U.S. deferred tax liability					(5.00%)
Transition Tax				3.30%	6.20%
Increased deferred tax liability associated with anticipated repatriation taxes					3.70%
Effect of U.S. federal corporate rate reduction on net current year U.S. deferred tax activity					2.00%
Other items, net			0.90%	0.50%	1.60%
Effective tax rate			14.70%	19.00%	17.90%

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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 income tax rates.

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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 deduction for qualified production activity.

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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 research tax credit.

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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 the Transition Tax incentive for U.S. entities to repatriate accumulated foreign earnings under the 2017 Tax Act.

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Effective income tax rate reconciliation change in enacted tax rate deferred tax percent.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed as the increase or decrease in the deferred tax liability associated with anticipated repatriation taxes under the 2017 Tax Act.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to revisions in previously reported amounts of income tax provision and all income tax settlements during the period.

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