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Leases - Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 27, 2020 USD ($) ft² | Jun. 27, 2020 USD ($) ft² | Sep. 30, 2019 USD ($)
Lessee Lease Description [Line Items] |  |  |
Boston Lease Square Feet | ft² | 250,000 | 250,000 |
Boston lease year one payments | $ 11,000,000.0 | $ 11,000,000.0 |
Boston lease per square foot annual increase | 1 | 1 |
Boston lease annual increase | 300,000 | 300,000 |
Boston lease building operating cost amount estimate year one | 7,100,000 | 7,100,000 |
Boston lease leasehold improvement allowance | 25,000,000 | 25,000,000 |
Boston lease leasehold improvement allowance per square foot | 100 | 100 |
Operating lease not commenced, future lease payments | $ 900,000 | $ 900,000 |
Operating leases not yet commenced, term | 5 years | 5 years |
Operating right-of-use lease assets | $ 151,044,000 | $ 151,044,000 | $ 0
Operating lease, liability | 216,079,000 | 216,079,000 |
Lease Cost |  |  |
Operating cash flows from operating leases | 12,127,000 | 27,267,000 |
Onshape |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating lease, impairment loss |  | 700,000 |
Facility Closures and Related Costs |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating lease liability, net. restructured facilities | 12,000,000.0 | 12,000,000.0 | $ 16,500,000
Operating right-of-use lease assets | 4,300,000 | 4,300,000 |
Operating lease, liability | 16,300,000 | 16,300,000 |
Lease Cost |  |  |
Operating cash flows from operating leases | 4,600,000 | 9,100,000 |
Facility Closures and Related Costs | Prior Headquarters |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating lease, impairment loss |  | 4,200,000 |
Facility Closures and Related Costs | Operating Lease Short Term Lease Obligation |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating lease, liability | 10,200,000 | 10,200,000 |
Facility Closures and Related Costs | Operating Lease Long Term Lease Obligation |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating lease, liability | 6,100,000 | 6,100,000 |
Sublease Income Committed |  |  |
Lessee Lease Description [Line Items] |  |  |
Sublease income assumed | 3,000,000.0 | 3,000,000.0 |
Sublease Income Estimated Uncommitted |  |  |
Lessee Lease Description [Line Items] |  |  |
Sublease income assumed | $ 1,300,000 | $ 1,300,000 |

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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