Earnings per share - Computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net income attributable to common shareholders, basic	$ 948,542	$ 681,851	$ 1,646,962	$ 1,332,678
Net income attributable to common shareholders, diluted	$ 948,542	$ 681,851	$ 1,646,962	$ 1,332,678
Denominator:
Basic - weighted average common shares (in shares)	128,752,836	128,426,247	128,707,962	128,449,398
Increase in weighted average common shares from dilutive effect of equity-based awards (in shares)	2,005,972	1,941,104	2,008,520	1,864,928
Diluted - weighted average common shares, assuming exercise of equity-based awards (in shares)	130,758,808	130,367,351	130,716,482	130,314,326
Basic earnings per share (in USD per share)	$ 7.37	$ 5.31	$ 12.80	$ 10.38
Diluted earnings per share (in USD per share)	$ 7.25	$ 5.23	$ 12.60	$ 10.23