v3.26.1
Investments and Fair Value Measurement - Schedule of Quantitative Inputs and Assumptions used for Valuation of Investments (Details)
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Owned, Fair Value $ 186,519,761 $ 183,338,199
Fair Value, Inputs, Level 3 [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Owned, Fair Value $ 976,991,236 $ 635,616,666
Equity Investments [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.129 0.109
Equity Investments [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.10 0.10
Equity Investments [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.15 0.15
Equity Investments [Member] | Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Owned, Fair Value $ 962,188,936 $ 34,577,371
Equity Investments [Member] | Measurement Input Terminal Value Multiple [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.086 0.06
Equity Investments [Member] | Measurement Input Terminal Value Multiple [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.01 0.01
Equity Investments [Member] | Measurement Input Terminal Value Multiple [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.15 0.15
Debt Investments [Member] | Measurement Input Yield [Member] | Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.137 0.137
Debt Investments [Member] | Measurement Input Yield [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.083 0.083
Debt Investments [Member] | Measurement Input Yield [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Company, Investment Owned, Measurement Input 0.156 0.156
Debt Investments [Member] | Measurement Input Yield [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | BXINFRA Aggregator (CYM) L.P. [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment Owned, Fair Value $ 14,802,300 $ 670,194,037