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Leases - Narrative Information (Details)	Feb. 08, 2022 USD ($) renewalOption	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
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

X

- Definition

Annual Rent Escalation Percentage

+ References

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- Definition

Lessee Operating Lease Monthly Base Rent Per Square Foot

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- Definition

Description of term of lessee's option for the construction of a fifth building under operating lease.

+ References

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- Definition

The number of renewal options under the terms of the lease.

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Rent Abatement Period

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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
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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-SubTopic 20
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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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-Topic 954
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-Section 45
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