Charge related to effects of Non US jurisdiction tax matter.

No definition available.

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- Definition

Income tax disclosure [Line Items]

+ References

No definition available.

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- Definition

Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Resulting Change in Valuation Allowance

+ References

No definition available.

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- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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- Definition

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

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- Definition

Estimated amount of loss resulting from an adverse tax position.

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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- Definition

Amount of unrecognized tax benefits.

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- Definition

Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 28, 2020	Sep. 30, 2016	Mar. 31, 2021	Mar. 28, 2020	Sep. 30, 2020
Income Tax Disclosure [Line Items]
Federal statutory income tax rate	21.00%		21.00%		21.00%	21.00%
Charge related to effects of Non US Jurisdiction Tax Matter		$ 36.1			$ 36.1
US Income taxes on repatriated foreign earnings					2.9
Unrecognized tax benefits	$ 47.7				47.7		$ 16.1
Income tax provision upon recognition of unrecognized tax benefit	47.7				47.7
Unrecognized tax benefits that would impact valuation allowance	9.7				9.7
Potential decrease in unrecognized tax benefits	28.0				28.0
Arena Solutions
Income Tax Disclosure [Line Items]
Reduction of valuation allowance	$ 42.3
Onshape
Income Tax Disclosure [Line Items]
Reduction of valuation allowance						$ 21.2
KOREA, REPUBLIC OF
Income Tax Disclosure [Line Items]
Charge related to effects of unrecognized tax benefit					$ 33.2
Income tax examination, estimate of possible loss				$ 12.0