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DEBT - Narrative (Details)
 9 Months Ended
Feb. 03, 2025
USD ($)
Dec. 02, 2024
USD ($)
Sep. 17, 2024
USD ($)
Sep. 10, 2024
USD ($)
Jul. 19, 2024
USD ($)
Jul. 18, 2024
USD ($)
Jan. 05, 2023
USD ($)
extension
Jan. 05, 2022
USD ($)
extension
Jan. 26, 2021
USD ($)
Oct. 31, 2014
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 09, 2024
USD ($)
Jul. 30, 2019
USD ($)
Jul. 19, 2017
USD ($)
May 23, 2017
USD ($)
Mar. 01, 2017
USD ($)
Debt Instrument [Line Items]                                  
Repayments of Unsecured Debt                     $ 225,000,000 $ 0          
Repayment of unsecured line of credit                     0 100,000,000          
Borrowings                     0 100,000,000          
American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Repayments of Unsecured Debt                     225,000,000 0          
Repayment of unsecured line of credit                     0 100,000,000          
Borrowings                     $ 0 $ 100,000,000          
American Assets Trust, L.P. | Treasury Lock                                  
Debt Instrument [Line Items]                                  
Notional Amount       $ 150,000,000                 $ 150,000,000        
Loss on derivatives       $ 1,300,000                          
3.375% Senior Notes | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                 3.375%                
3.375% Senior Notes | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                 3.375%   3.375%            
Face amount of debt                 $ 500,000,000                
Note offering percent                 0.98935                
Effective interest rate                 3.502%                
Proceeds from debt, net of issuance costs                 $ 489,700,000                
Maximum aggregate debt ratio                     60.00%            
Minimum debt service ratio                     1.5            
Maximum secured debt ratio                     40.00%            
Minimum maintenance of total unencumbered assets                     150.00%            
Senior Guaranteed Notes, Series A | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Repayments of Unsecured Debt                 150,000,000                
Make-whole payment                 3,900,000                
Second Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Repayment of unsecured line of credit                 $ 100,000,000                
6.150% Senior Notes | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate     6.15%                            
6.150% Senior Notes | American Assets Trust, L.P. | Treasury Lock                                  
Debt Instrument [Line Items]                                  
Effective interest rate                     6.209%            
6.150% Senior Notes | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate     6.15%               6.15%            
Face amount of debt     $ 525,000,000                            
Note offering percent     0.99671                            
Effective interest rate     6.194%                            
Proceeds from debt, net of issuance costs     $ 518,200,000                            
Note Purchase Agreement | Senior Guaranteed Notes | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Face amount of debt                   $ 350,000,000              
Partial debt repayment, minimum percentage of principal                   5.00%              
Full debt repayment percentage of principal plus a make-whole amount                   100.00%              
Note Purchase Agreement | Senior Guaranteed Notes, Series A | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                   4.04%              
Face amount of debt                   $ 150,000,000              
Note Purchase Agreement | Series B Notes | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                   4.45%              
Face amount of debt                   $ 100,000,000              
Note Purchase Agreement | Senior Guaranteed Notes, Series C | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                   4.50%              
Face amount of debt                   $ 100,000,000              
Senior Guaranteed Notes, Series D | American Assets Trust, L.P. | Treasury Lock                                  
Debt Instrument [Line Items]                                  
Effective interest rate                     3.87%            
Senior Guaranteed Notes, Series D | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                     4.29%           4.29%
Face amount of debt                                 $ 250,000,000
Senior Guaranteed Notes, Series E | American Assets Trust, L.P. | Treasury Lock                                  
Debt Instrument [Line Items]                                  
Effective interest rate                     4.18%            
Senior Guaranteed Notes, Series E | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                     4.24%         4.24%  
Face amount of debt                               $ 100,000,000  
Senior Guaranteed Notes, Series F | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                             3.78%    
Face amount of debt                             $ 100,000,000    
Repayments of Unsecured Debt         $ 100,000,000                        
Borrowings           $ 100,000,000                      
Senior Guaranteed Notes, Series G | American Assets Trust, L.P. | Treasury Lock                                  
Debt Instrument [Line Items]                                  
Effective interest rate                     3.88%            
Senior Guaranteed Notes, Series G | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                     3.91%     3.91%      
Face amount of debt                           $ 150,000,000      
Third Amended and Restated Credit Facility | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Revolving credit facility borrowing limit, maximum borrowing capacity               $ 500,000,000                  
Third Amended and Restated Credit Facility | American Assets Trust, L.P. | Base Rate                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               1.00%                  
Third Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Revolving credit facility borrowing limit, maximum borrowing capacity               $ 100,000,000                  
Number of extensions available | extension               2                  
Extension term               6 months                  
Third Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P. | SOFR                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               1.00%                  
Third Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P. | Federal Funds Rate                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               0.50%                  
Third Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P. | Minimum | SOFR                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               1.20%                  
Third Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P. | Minimum | Base Rate                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               0.20%                  
Third Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P. | Maximum | SOFR                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               1.70%                  
Third Amended and Restated Credit Facility | Unsecured term loans, net | American Assets Trust, L.P. | Maximum | Base Rate                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               0.70%                  
Third Amended and Restated Credit Facility | Unsecured line of credit, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Debt issuance costs, net, revolving credit facility                     $ 200,000            
Weighted average interest rate                     5.53%            
Maximum leverage ratio of revolving credit facility               60.00%                  
Maximum secured leverage ratio on revolving credit facility               40.00%                  
Minimum fixed charge coverage ratio covenant threshold               1.50                  
Minimum interest coverage ratio covenant threshold               1.75                  
Maximum unsecured leverage ratio (in percentage)               60.00%                  
Maximum recourse indebtedness of total asset value               15.00%                  
Percentage annual distributions cannot exceed funds from operations               95.00%                  
Third Amended and Restated Credit Facility | Unsecured line of credit, net | American Assets Trust, L.P. | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Revolving credit facility borrowing limit, maximum borrowing capacity               $ 400,000,000                  
Third Amended and Restated Credit Facility | Unsecured line of credit, net | American Assets Trust, L.P. | Revolving Credit Facility | Minimum | SOFR                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               1.05%                  
Third Amended and Restated Credit Facility | Unsecured line of credit, net | American Assets Trust, L.P. | Revolving Credit Facility | Minimum | Base Rate                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               0.10%                  
Third Amended and Restated Credit Facility | Unsecured line of credit, net | American Assets Trust, L.P. | Revolving Credit Facility | Maximum | SOFR                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               1.50%                  
Third Amended and Restated Credit Facility | Unsecured line of credit, net | American Assets Trust, L.P. | Revolving Credit Facility | Maximum | Base Rate                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               0.50%                  
Term Loan A | American Assets Trust, L.P. | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Fixed interest rate on derivative                     2.70%            
Term Loan B | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Face amount of debt             $ 150,000,000                    
Term Loan C | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Face amount of debt             $ 75,000,000                    
Term Loan B & Term Loan C | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Number of extensions available | extension             1                    
Extension term             12 months                    
Series B Notes | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Repayments of Unsecured Debt   $ 100,000,000                              
Senior Guaranteed Notes, Series C | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Stated Interest Rate                     4.50%            
Repayments of Unsecured Debt $ 100,000,000                                
Revolver Loan | Unsecured term loans, net | American Assets Trust, L.P.                                  
Debt Instrument [Line Items]                                  
Repayments of Unsecured Debt     $ 100,000,000