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Subsequent Events (Detail) - Secured Debt - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
	Nov. 08, 2023	Sep. 30, 2023	Oct. 06, 2023	Oct. 04, 2023
Margin Loan Facility | Morgan Stanley
Subsequent events
Floor share price of pledged common stock that would trigger mandatory repayment of outstanding borrowings under the facility		$ 14.00
Repayment of principal		$ 40.0
Subsequent Events | Incremental Borrowing Facility | Safehold Inc.
Subsequent events
Incremental borrowing capacity available to replenish funds expended to make voluntary prepayments on the Margin Loan Facility				$ 25.0
Subsequent Events | Margin Loan Facility | Morgan Stanley
Subsequent events
Floor share price of pledged common stock that would trigger mandatory repayment of outstanding borrowings under the facility			$ 10.00
Repayment of principal	$ 19.8

X

- Definition

Amount of incremental borrowing capacity under the credit facility available to replenish funds expended by the company to make voluntary prepayments on the Margin Loan Facility.

+ References

No definition available.

+ Details

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X

- Definition

The floor share price of pledged common stock that would trigger mandatory repayment of outstanding borrowings under the facility.

+ References

No definition available.

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X

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

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