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Detail of secured and unsecured debt (Details) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended
Jul. 22, 2024
Jun. 30, 2024
Sep. 30, 2023
Feb. 29, 2024
Debt Instrument        
Effective rate (as a percent)   3.89%    
Future principal payments due on secured and unsecured debt        
2024   $ 32    
2025   600,034    
2026   784,684    
2027   350,038    
2028   625,041    
Thereafter   10,150,438    
Principal   12,510,267    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (86,212)    
Total Consolidated   $ 12,424,055    
99 Coolidge Avenue | Alexandria        
Debt Instrument        
Noncontrolling Interest, Ownership Percentage by Parent   75.00%    
Secured notes payable        
Debt Instrument        
Effective rate (as a percent)   8.13%    
Future principal payments due on secured and unsecured debt        
2024   $ 32    
2025   34    
2026   134,684    
2027   38    
2028   41    
Thereafter   438    
Principal   135,267    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (325)    
Total Consolidated   $ 134,942    
Secured notes payable maturing on 11/19/26        
Debt Instrument        
Applicable margin (as a percent)   2.70%    
Effective rate (as a percent)   8.14%    
Maturity Date   Nov. 19, 2026    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   134,648    
2027   0    
2028   0    
Thereafter   0    
Principal   134,648    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (325)    
Total Consolidated   134,323    
Secured notes payable maturing on 11/19/26 | 99 Coolidge Avenue        
Debt Instrument        
Debt instrument, borrowing capacity   $ 60,700    
Secured Notes Payable Maturing on 7/1/36        
Debt Instrument        
Stated interest rate (as a percent)   6.50%    
Effective rate (as a percent)   6.50%    
Maturity Date   Jul. 01, 2036    
Future principal payments due on secured and unsecured debt        
2024   $ 32    
2025   34    
2026   36    
2027   38    
2028   41    
Thereafter   438    
Principal   619    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   0    
Total Consolidated   $ 619    
Unsecured Debt        
Debt Instrument        
Effective rate (as a percent)   3.84%    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   600,000    
2026   650,000    
2027   350,000    
2028   625,000    
Thereafter   10,150,000    
Principal   12,375,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (85,887)    
Total Consolidated   $ 12,289,113    
Unsecured senior line of credit        
Debt Instrument        
Applicable margin (as a percent)   0.855% 0.875%  
Line of Credit Facility, Maximum Borrowing Capacity   $ 5,000,000    
Future principal payments due on secured and unsecured debt        
Total Consolidated   $ 0    
3.45% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   3.45%    
Effective rate (as a percent)   3.62%    
Maturity Date   Apr. 30, 2025    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   600,000    
2026   0    
2027   0    
2028   0    
Thereafter   0    
Principal   600,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (739)    
Total Consolidated   $ 599,261    
4.30% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   4.30%    
Effective rate (as a percent)   4.50%    
Maturity Date   Jan. 15, 2026    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   300,000    
2027   0    
2028   0    
Thereafter   0    
Principal   300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (778)    
Total Consolidated   $ 299,222    
3.80% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   3.80%    
Effective rate (as a percent)   3.96%    
Maturity Date   Apr. 15, 2026    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   350,000    
2027   0    
2028   0    
Thereafter   0    
Principal   350,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (899)    
Total Consolidated   $ 349,101    
3.95% Unsecured Senior Notes Payable Due in 2027        
Debt Instrument        
Stated interest rate (as a percent)   3.95%    
Effective rate (as a percent)   4.13%    
Maturity Date   Jan. 15, 2027    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   350,000    
2028   0    
Thereafter   0    
Principal   350,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (1,321)    
Total Consolidated   $ 348,679    
3.95% Unsecured Senior Notes Payable Due in 2028        
Debt Instrument        
Stated interest rate (as a percent)   3.95%    
Effective rate (as a percent)   4.07%    
Maturity Date   Jan. 15, 2028    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   425,000    
Thereafter   0    
Principal   425,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (1,523)    
Total Consolidated   $ 423,477    
4.50% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   4.50%    
Effective rate (as a percent)   4.60%    
Maturity Date   Jul. 30, 2029    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   300,000    
Principal   300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (1,138)    
Total Consolidated   $ 298,862    
2.75% Unsecured Senior Notes Payable Due 2029        
Debt Instrument        
Stated interest rate (as a percent)   2.75%    
Effective rate (as a percent)   2.87%    
Maturity Date   Dec. 15, 2029    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   400,000    
Principal   400,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (2,269)    
Total Consolidated   $ 397,731    
4.70% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   4.70%    
Effective rate (as a percent)   4.81%    
Maturity Date   Jul. 01, 2030    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   450,000    
Principal   450,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (2,241)    
Total Consolidated   $ 447,759    
4.90% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   4.90%    
Effective rate (as a percent)   5.05%    
Maturity Date   Dec. 15, 2030    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   700,000    
Principal   700,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (5,121)    
Total Consolidated   $ 694,879    
3.375% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   3.375%    
Effective rate (as a percent)   3.48%    
Maturity Date   Aug. 15, 2031    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   750,000    
Principal   750,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (4,669)    
Total Consolidated   $ 745,331    
2.00% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   2.00%    
Effective rate (as a percent)   2.12%    
Maturity Date   May 18, 2032    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   900,000    
Principal   900,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (7,428)    
Total Consolidated   $ 892,572    
1.875% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   1.875%    
Effective rate (as a percent)   1.97%    
Maturity Date   Feb. 01, 2033    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   1,000,000    
Principal   1,000,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (7,543)    
Total Consolidated   $ 992,457    
2.95% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   2.95%    
Effective rate (as a percent)   3.07%    
Maturity Date   Mar. 15, 2034    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   800,000    
Principal   800,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (7,613)    
Total Consolidated   $ 792,387    
4.75% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   4.75%    
Effective rate (as a percent)   4.88%    
Maturity Date   Apr. 15, 2035    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   500,000    
Principal   500,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (5,185)    
Total Consolidated   $ 494,815    
5.25% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   5.25%   5.25%
Effective rate (as a percent)   5.38%    
Maturity Date   May 15, 2036    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   400,000    
Principal   400,000   $ 400,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (4,280)    
Total Consolidated   $ 395,720    
4.85% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   4.85%    
Effective rate (as a percent)   4.93%    
Maturity Date   Apr. 15, 2049    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   300,000    
Principal   300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (2,929)    
Total Consolidated   $ 297,071    
4.00% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   4.00%    
Effective rate (as a percent)   3.91%    
Maturity Date   Feb. 01, 2050    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   700,000    
Principal   700,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   10,049    
Total Consolidated   $ 710,049    
3.00% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   3.00%    
Effective rate (as a percent)   3.08%    
Maturity Date   May 18, 2051    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   850,000    
Principal   850,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (11,417)    
Total Consolidated   $ 838,583    
3.55% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   3.55%    
Effective rate (as a percent)   3.63%    
Maturity Date   Mar. 15, 2052    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   1,000,000    
Principal   1,000,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (13,892)    
Total Consolidated   $ 986,108    
5.15% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   5.15%    
Effective rate (as a percent)   5.26%    
Maturity Date   Apr. 15, 2053    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   500,000    
Principal   500,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (7,702)    
Total Consolidated   $ 492,298    
5.625% Unsecured Senior Notes Payable        
Debt Instrument        
Stated interest rate (as a percent)   5.625%   5.625%
Effective rate (as a percent)   5.71%    
Maturity Date   May 15, 2054    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   0    
Thereafter   600,000    
Principal   600,000   $ 600,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (6,801)    
Total Consolidated   593,199    
Commercial Paper        
Debt Instrument        
Commercial paper, maximum issuance   2,500,000    
Future principal payments due on secured and unsecured debt        
Principal   $ 199,600    
Commercial Paper | Unsecured senior line of credit        
Debt Instrument        
Effective rate (as a percent)   5.57%    
Maturity Date   Jan. 22, 2028    
Future principal payments due on secured and unsecured debt        
2024   $ 0    
2025   0    
2026   0    
2027   0    
2028   200,000    
Thereafter   0    
Principal   200,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium   (448)    
Total Consolidated   $ 199,552    
Commercial Paper | Unsecured senior line of credit | Subsequent Event        
Debt Instrument        
Maturity Date Jan. 22, 2030