Shareholders’ equity - Narrative (Details) - USD ($) $ in Billions	3 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Class of Stock [Line Items]
Stock authorized for repurchase	$ 5.0
Stock repurchased	$ 4.2
Common Stock
Class of Stock [Line Items]
Change in shares issued (in shares)	0	201,343,253
Ordinary shares
Class of Stock [Line Items]
Treasury stock, shares, retired		30,827,929
Ordinary shares canceled (in shares)		201,343,253