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v3.20.4

Leases - Additional Information (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) ft² | Dec. 28, 2019 USD ($) | Sep. 30, 2020 USD ($) | Feb. 28, 2019 USD ($)
Lessee Lease Description [Line Items] |  |  |  |
Boston Lease Square Feet | ft² | 250,000 |  |  |
Boston lease year one payments | $ 11,000,000.0 |  |  |
Boston lease per square foot annual increase | 1 |  |  |
Boston lease annual increase | 300,000 |  |  |
Boston lease building operating cost amount estimate year one | 7,100,000 |  |  |
Boston lease leasehold improvement allowance | 25,000,000 |  |  |
Boston lease leasehold improvement allowance per square foot | 100 |  |  |
Payments to be received as sublease income |  |  |  | $ 9,100,000
Operating right-of-use lease assets | 145,252,000 |  | $ 149,933,000 |
Operating lease, liability | 206,446,000 |  |  |
Lease Cost |  |  |  |
Operating cash flows from operating leases | 14,060,000 | $ 5,498,000 |  |
Facility Closures and Related Costs |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Operating lease liability, net. restructured facilities | 7,600,000 |  | $ 11,300,000 |
Operating right-of-use lease assets | 2,600,000 |  |  |
Operating lease, liability | 10,200,000 |  |  |
Lease Cost |  |  |  |
Operating cash flows from operating leases | 3,800,000 | $ 2,400,000 |  |
Facility Closures and Related Costs | Operating Lease Short Term Lease Obligation |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Operating lease, liability | 6,600,000 |  |  |
Facility Closures and Related Costs | Operating Lease Long Term Lease Obligation |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Operating lease, liability | 3,600,000 |  |  |
Sublease Income Committed |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Sublease income assumed | 2,300,000 |  |  |
Sublease Income Estimated Uncommitted |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |
Sublease income assumed | $ 300,000 |  |  |

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