Stockholders’ equity - Narrative (Details) $ in Billions	3 Months Ended	12 Months Ended
	Oct. 31, 2024 shares	Jul. 31, 2025 USD ($) trust shares	Jul. 31, 2024 shares	Jul. 31, 2023 shares	Mar. 31, 2025 USD ($)
Class of Stock [Line Items]
Number of employee benefit trusts | trust		2
Additional authorized stock to repurchased | $					$ 1.0
Authorized stock to repurchased | $					$ 5.0
Stock repurchased | $		$ 4.0
Common Stock [Member]
Class of Stock [Line Items]
Change in shares issued (in shares) | shares	201,343,253	201,343,253	0	0
Ordinary shares
Class of Stock [Line Items]
Treasury stock, shares, retired | shares	30,827,929
Ordinary shares canceled (in shares) | shares	201,343,253