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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income attributable to common shareholders, basic	$ 726,574	$ 590,889	$ 2,059,252	$ 1,373,980
Net income attributable to common shareholders, diluted	$ 726,574	$ 590,889	$ 2,059,252	$ 1,373,980
Denominator:
Basic - weighted average common shares (in shares)	128,502,829	128,293,039	128,467,209	128,343,788
Increase in weighted average common shares from dilutive effect of equity-based awards (in shares)	2,090,197	1,858,448	1,702,122	1,488,201
Diluted - weighted average common shares, assuming exercise of equity-based awards (in shares)	130,593,026	130,151,487	130,169,331	129,831,989
Basic earnings per share (in USD per share)	$ 5.65	$ 4.61	$ 16.03	$ 10.71
Diluted earnings per share (in USD per share)	$ 5.56	$ 4.54	$ 15.82	$ 10.58