Fair value measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 681,400	$ 211,617
Total derivative assets	317,310	127,856
Total financial liabilities at amortized cost	964,209	962,765
2030 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	428,502	427,837
2029 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	535,707	534,928
2030 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	127,600	46,400
2029 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	186,800	75,700
Bitcoin purchase option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	2,910	5,756
2030 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	267,600	83,117
2029 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	413,800	128,500
Quoted prices in active markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Total derivative assets	0	0
Total financial liabilities at amortized cost	3,264,440	1,195,933
Quoted prices in active markets (Level 1) \| 2030 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	1,291,080	483,089
Quoted prices in active markets (Level 1) \| 2029 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	1,973,360	712,844
Quoted prices in active markets (Level 1) \| 2030 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	0	0
Quoted prices in active markets (Level 1) \| 2029 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	0	0
Quoted prices in active markets (Level 1) \| Bitcoin purchase option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	0	0
Quoted prices in active markets (Level 1) \| 2030 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Quoted prices in active markets (Level 1) \| 2029 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	681,400	211,617
Total derivative assets	2,910	5,756
Total financial liabilities at amortized cost	0	0
Significant other observable inputs (Level 2) \| 2030 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	0	0
Significant other observable inputs (Level 2) \| 2029 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	0	0
Significant other observable inputs (Level 2) \| 2030 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	0	0
Significant other observable inputs (Level 2) \| 2029 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	0	0
Significant other observable inputs (Level 2) \| Bitcoin purchase option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	2,910	5,756
Significant other observable inputs (Level 2) \| 2030 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	267,600	83,117
Significant other observable inputs (Level 2) \| 2029 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	413,800	128,500
Significant unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Total derivative assets	314,400	122,100
Total financial liabilities at amortized cost	0	0
Significant unobservable inputs (Level 3) \| 2030 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	0	0
Significant unobservable inputs (Level 3) \| 2029 Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities at amortized cost	0	0
Significant unobservable inputs (Level 3) \| 2030 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	127,600	46,400
Significant unobservable inputs (Level 3) \| 2029 Capped Call Transactions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	186,800	75,700
Significant unobservable inputs (Level 3) \| Bitcoin purchase option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total derivative assets	0	0
Significant unobservable inputs (Level 3) \| 2030 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Significant unobservable inputs (Level 3) \| 2029 Prepaid Forward Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 0	$ 0