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Leases - Narrative Information (Details) | Feb. 08, 2022 USD ($) renewalOption | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
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Leases [Abstract] |  |  |
New campus lease lessee option term for construction of fifth building | 6 years |  |
New campus rent abatement period | 10 months |  |
New campus lease monthly base rent per square foot | $ 6 |  |
New campus lease annual rent escalation percentage | 3.00% |  |
New campus lease term | 13 years 7 months |  |
New campus lease number of renewal options | renewalOption | 2 |  |
New campus lease renewal term | 5 years |  |
Restricted cash in connection with operating leases |  | $ 7,800,000 | $ 3,200,000

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- Definition Term of lessee's operating lease renewal, 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 (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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