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Stockholders' equity (Details) - USD ($)	3 Months Ended		8 Months Ended	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Jun. 30, 2025	Jan. 21, 2025
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)	999,999,999		999,999,999
Dividends declared (in USD per share)	$ 0	$ 0
Ordinary shares
Subsidiary, Sale of Stock [Line Items]
Common stock, shares outstanding (in shares)	283,458,548		283,458,548	258,103,209
Management and PodTech Innovation Inc
Subsidiary, Sale of Stock [Line Items]
Issuance of ordinary shares (in shares)	582,245			842,291
At the market facility
Subsidiary, Sale of Stock [Line Items]
Maximum value of shares to be issued under share sale option agreement					$ 1,000,000,000
Shares issued under facility (in shares)	66,707,732		66,707,732
Proceeds from issuance of common stock under facility			$ 999,999,452

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