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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 27, 2020 | Sep. 30, 2016 | Jun. 30, 2021 | Jun. 27, 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 |  |  |  | $ 37.3 |  |
US Income taxes on repatriated foreign earnings |  |  |  | 2.9 |  |
Unrecognized tax benefits | $ 20.5 |  |  | 20.5 |  | $ 16.1
Income tax provision upon recognition of unrecognized tax benefit | 20.5 |  |  | 20.5 |  |
Unrecognized tax benefits that would impact valuation allowance | 10.0 |  |  | 10.0 |  |
Potential decrease in unrecognized tax benefits | 1.0 |  |  | 1.0 |  |
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 Non US Jurisdiction Tax Matter |  |  |  | $ 34.4 |  |
Payment related to effects of Non US jurisdiction tax matter | $ 20.0 |  | $ 12.0 |  |  |

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