v3.26.1
Investments and Fair Value Measurement - Schedule of Fair Value of Investments for Level III Inputs (Details) - BXINFRA Aggregator (CYM) L.P. [Member]
 3 Months Ended
Jun. 30, 2026
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance $ 853,532,236
Purchases 258,896,471
Sales and proceeds from investments (19,745,807)
Net realized and unrealized gain (loss) on investments and translation of assets and liabilities in foreign currencies $ 70,828,097
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance $ 1,163,510,997
Equity Securities, Investment Summary [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 818,954,865
Purchases 257,586,536
Sales and proceeds from investments 0
Net realized and unrealized gain (loss) on investments and translation of assets and liabilities in foreign currencies $ 72,167,296
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance $ 1,148,708,697
Debt Investments [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 34,577,371
Purchases 1,309,935
Sales and proceeds from investments (19,745,807)
Net realized and unrealized gain (loss) on investments and translation of assets and liabilities in foreign currencies $ (1,339,199)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance $ 14,802,300