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Financial assets - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended
	Aug. 23, 2024	Jul. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Jun. 13, 2025	Dec. 06, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gain (loss)			$ 5,756,000	$ 4,215,000
Unrealized gain (loss) on financial instruments			(664,993,000)	0
Total financial assets			681,400,000		$ 211,617,000
Electricity financial asset
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Increase (decrease) in electricity financial asset	$ 7,211,000
Realized gain (loss)		$ 452,000	0	4,215,000
Unrealized gain (loss) on financial instruments				$ 3,448,000
Total financial assets			0		$ 0
Total financial assets			$ 0
2030 Convertible Notes | Convertible debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal amount							$ 440,000,000
Stated interest rate							3.25%
2029 Convertible Notes | Convertible debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal amount						$ 550,000,000
Stated interest rate						3.50%

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