Earnings per share - Computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net income attributable to common shareholders, basic	$ 960,866	$ 726,574	$ 2,607,828	$ 2,059,252
Net income attributable to common shareholders, diluted	$ 960,866	$ 726,574	$ 2,607,828	$ 2,059,252
Denominator:
Basic - weighted average common shares (in shares)	128,442,623	128,502,829	128,619,515	128,467,209
Increase in weighted average common shares from dilutive effect of equity-based awards (in shares)	1,878,179	2,090,197	1,956,710	1,702,122
Diluted - weighted average common shares, assuming exercise of equity-based awards (in shares)	130,320,802	130,593,026	130,576,225	130,169,331
Basic earnings per share (in USD per share)	$ 7.48	$ 5.65	$ 20.28	$ 16.03
Diluted earnings per share (in USD per share)	$ 7.37	$ 5.56	$ 19.97	$ 15.82