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Leases - Additional Information (Details) | 12 Months Ended |
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Sep. 30, 2021 USD ($) ft² | Sep. 30, 2020 USD ($)
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 |
Operating right-of-use lease assets | 152,337,000 | $ 149,933,000
Operating lease, liability | 208,799,000 |
Lease Cost |  |
Operating cash flows from operating leases | 50,299,000 |
Facility Closures and Related Costs |  |
Lessee Lease Description [Line Items] |  |
Operating lease liability, net. restructured facilities | 3,600,000 | $ 11,300,000
Operating right-of-use lease assets | 1,200,000 |
Operating lease, liability | 4,800,000 |
Lease Cost |  |
Operating cash flows from operating leases | 7,800,000 |
Facility Closures and Related Costs | Prior Headquarters |  |
Lessee Lease Description [Line Items] |  |
Operating lease, impairment loss | 100,000 |
Facility Closures and Related Costs | Operating Lease Short Term Lease Obligation |  |
Lessee Lease Description [Line Items] |  |
Operating lease, liability | 4,200,000 |
Facility Closures and Related Costs | Operating Lease Long Term Lease Obligation |  |
Lessee Lease Description [Line Items] |  |
Operating lease, liability | 600,000 |
Sublease Income Committed |  |
Lessee Lease Description [Line Items] |  |
Sublease income assumed | 1,200,000 |
Sublease Income Estimated Uncommitted |  |
Lessee Lease Description [Line Items] |  |
Sublease income assumed | $ 0 |

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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957 + Details
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