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, 2023	Mar. 31, 2022		Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income attributable to common shareholders, basic	$ 590,889	$ 348,017	[1]	$ 1,373,980	$ 1,186,774	[1]
Net income attributable to common shareholders, diluted	$ 590,889	$ 348,017		$ 1,373,980	$ 1,186,774
Denominator:
Basic - weighted average common shares (in shares)	128,293,039	128,426,675		128,343,788	128,549,040
Increase in weighted average common shares from dilutive effect of equity-based awards (in shares)	1,858,448	1,916,906		1,488,201	1,889,553
Diluted - weighted average common shares, assuming exercise of equity-based awards (in shares)	130,151,487	130,343,581		129,831,989	130,438,593
Basic earnings per share (in USD per share)	$ 4.61	$ 2.71	[1]	$ 10.71	$ 9.23	[1]
Diluted earnings per share (in USD per share)	$ 4.54	$ 2.67	[1]	$ 10.58	$ 9.10	[1]

[1] *Prior period amounts have been reclassified to reflect the income statement reclassification as described in Note 1.