v3.26.1
Summary of Significant Accounting Policies (Additional Information) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2026
Mar. 31, 2026
Dec. 01, 2025
Organizational And Offering Costs Expense   $ 1,385,106 $ 1,383,154  
Cash   2,168,431 342,030  
Payable for investments purchased   1,496,125    
Offering memorandum and cost [Member]        
Organizational And Offering Costs Expense   2,588,670 2,420,000  
Deferred offering costs   636,535    
Additional Deferred Offering Costs   168,670    
Offering Cost amount   $ 1,089,168 1,557,033  
Common Class S [Member] | Units [Member]        
Management and Service Fees, Rate   0.85%    
Common Class D [Member] | Units [Member]        
Management and Service Fees, Rate   0.25%    
Macquarie Infrastructure Fund, L.P        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 $ 0 $ 0    
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate       12.00%
Organization expenses 0 1,952    
Deferred offering costs   1,089,168 1,557,033  
Payable for investments purchased   1,496,125 0  
Professional fees $ 0 745,096    
Professional fees payable   2,620,401 1,852,386  
Macquarie Infrastructure Fund, L.P | Commercial Paper [Member]        
Debt Instrument, Face Amount       $ 110,000
MIF Cayman, L.P.        
Cash   9,617,687 4,203,051  
Organizational expenses payable   110,147 110,147  
Professional fees [1]   154,681    
Professional fees payable   $ 294,277 $ 146,250  
[1] MIF Cayman, L.P. was formed on July 29, 2025 and commenced principal operations on October 31, 2025, and accordingly, there were no operations during the three months ended June 30, 2025.