Earnings per share - Computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net income attributable to common shareholders, basic	$ 698,420	$ 650,827
Net income attributable to common shareholders, diluted	$ 698,420	$ 650,827
Denominator:
Basic - weighted average common shares (in shares)	128,663,088	128,472,550
Increase in weighted average common shares from dilutive effect of equity-based awards (in shares)	2,017,154	1,890,891
Diluted - weighted average common shares, assuming exercise of equity-based awards (in shares)	130,680,242	130,363,441
Basic earnings per share (in USD per share)	$ 5.43	$ 5.07
Diluted earnings per share (in USD per share)	$ 5.34	$ 4.99