Financial instruments - Gain (losses) on derivative financial instruments recorded in consolidated statement if income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Deal-contingent forward contracts
Derivative [Line Items]
Gains (loss) on derivative financial instruments	$ 0	$ 0	$ 0	$ (389,992)
Forward exchange contracts
Derivative [Line Items]
Gains (loss) on derivative financial instruments	9,192	7,378	7,379	(7,425)
Costless collar contracts
Derivative [Line Items]
Gains (loss) on derivative financial instruments	0	4,308	0	9,632
Cross-currency swap contracts
Derivative [Line Items]
Gains (loss) on derivative financial instruments	$ 0	$ (2,976)	$ 0	$ (18,739)