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Related Party Transactions (Details)
$ / shares in Units, $ in Thousands, ft² in Millions
 1 Months Ended 3 Months Ended
Aug. 10, 2022
USD ($)
shares
Jan. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Feb. 28, 2022
USD ($)
director
shares
Jan. 31, 2022
director
Nov. 30, 2021
USD ($)
director
Jun. 30, 2021
USD ($)
ft²
agreement
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
employee
$ / shares
shares
Related Party Transaction [Line Items]                  
Management fee expense                 $ 5,199
Ground lease acquisition purchase price               $ 32,158 $ 50,803
Future funding obligation, amount               262,500  
Land and Related Ground Lease                  
Related Party Transaction [Line Items]                  
Leasehold improvement allowance, funded amount               $ 36,500  
Ground Lease Plus Fund                  
Related Party Transaction [Line Items]                  
Ground lease acquisition purchase price   $ 38,300              
Office space development property                  
Related Party Transaction [Line Items]                  
Number of square feet | ft²             1.1    
Proceeds from sale of acquisition right under purchase option agreement     $ 300            
Purchase price of property under purchase option agreement             $ 215,000    
Office space development property | Other expense                  
Related Party Transaction [Line Items]                  
Loss on sale of acquisition right under purchase option agreement     $ 1,900            
Caret Units                  
Related Party Transaction [Line Items]                  
Number of units sold | shares       108,571          
Proceeds from stock transaction       $ 19,000          
Number of shares to be sold under purchase commitment related to merger | shares       28,571          
Expected proceeds from sale of shares under purchase commitment       $ 5,000          
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director       1          
Period in which the entity is obligated to provide a public market listing       2 years          
Caret Units | MSD Partners                  
Related Party Transaction [Line Items]                  
Number of shares to be sold under purchase commitment related to merger | shares 100,000                
Expected proceeds from sale of shares under purchase commitment $ 20,000                
Existing third-party Caret unit                  
Related Party Transaction [Line Items]                  
Number of shares to be sold under purchase commitment related to merger | shares                 22,500
Expected proceeds from sale of shares under purchase commitment                 $ 4,500
Affiliated entity | iStar Inc.                  
Related Party Transaction [Line Items]                  
Management fee paid with common stock, period of restriction from selling stock                 2 years
Management fee, percent, threshold one                 1.00%
Management fee, percent, threshold two                 1.25%
Management fee, percent, threshold three                 1.375%
Management fee, percent, threshold four                 1.50%
Termination fee, percent of prior years management fee                 3.00%
Incentive fee                 $ 0
Payment to acquire purchase option agreement             $ 1,200    
Affiliated entity | iStar Inc. | General and Administrative Expense                  
Related Party Transaction [Line Items]                  
Management fee expense                 5,200
Reimbursed operating and administrative expenses                 3,100
Affiliated entity | iStar Inc. | Land and Related Ground Lease                  
Related Party Transaction [Line Items]                  
Number of agreements entered into to acquire land and related Ground Lease | agreement             2    
Purchase price per agreement for acquisition of land and related Ground Lease, subject to certain conditions being met           $ 33,300 $ 42,000    
Multiple required by seller that may trigger payment of additional consideration           1.25 1.25    
Percentage of required seller return on investment that may trigger payment of additional consideration           12.00% 9.00%    
Future funding obligation, amount           $ 51,800      
Affiliated entity | Minimum | iStar Inc.                  
Related Party Transaction [Line Items]                  
Management fee, shareholders' equity, incremental threshold amount two                 1,500,000
Management fee, shareholders' equity, incremental threshold amount three                 3,000,000
Management fee, shareholders' equity, incremental threshold amount four                 5,000,000
Affiliated entity | Maximum | iStar Inc.                  
Related Party Transaction [Line Items]                  
Management fee, shareholders' equity, incremental threshold amount one                 1,500,000
Management fee, shareholders' equity, incremental threshold amount two                 3,000,000
Management fee, shareholders' equity, incremental threshold amount three                 $ 5,000,000
Affiliated entity | Maximum | iStar Inc. | Land and Related Ground Lease                  
Related Party Transaction [Line Items]                  
Real estate, leasehold improvement allowance             $ 83,000    
Affiliated entity | IPO | iStar Inc.                  
Related Party Transaction [Line Items]                  
Share price (in dollars per share) | $ / shares                 $ 20.00
iStar Inc. | Land and Related Ground Lease                  
Related Party Transaction [Line Items]                  
Number of independent directors affiliated with an existing shareholder participating in or related to a particular project or transaction | director         1 1      
Leasehold Loan Fund                  
Related Party Transaction [Line Items]                  
Ownership percentage               53.00%  
iStar Inc.                  
Related Party Transaction [Line Items]                  
Number of years as active real estate investor                 20 years
Number of agreements entered into to acquire land and related Ground Lease | agreement             2    
iStar Inc. | MSD Partners                  
Related Party Transaction [Line Items]                  
Number of shares to be sold under purchase commitment related to merger | shares 5,405,406               5,405,406
Expected proceeds from sale of shares under purchase commitment $ 200,000                
Safehold, Inc. (Old SAFE)                  
Related Party Transaction [Line Items]                  
Number of employees | employee                 0
Safehold, Inc. (Old SAFE) | Caret Units                  
Related Party Transaction [Line Items]                  
Number of units sold | shares       108,571          
Percentage of authorized shares sold       1.08%          
Number of shares to be sold under purchase commitment related to merger | shares       28,571          
Percentage of authorized shares under commitment to be purchased       0.29%          
Expected proceeds from sale of shares under purchase commitment       $ 5,000          
Number of independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest | director       1          
Period in which the entity is obligated to provide a public market listing       2 years          
MSD Partners | Caret Units                  
Related Party Transaction [Line Items]                  
Number of shares to be sold under purchase commitment related to merger | shares                 100,000
Expected proceeds from sale of shares under purchase commitment                 $ 20,000