Financial instruments - Gain (losses) on derivative financial instruments recorded in consolidated statement if income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
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	(2,249)	(13,439)	(1,813)	(14,803)
Costless collar contracts
Derivative [Line Items]
Gains (loss) on derivative financial instruments	0	(65)	0	5,324
Cross-currency swap contracts
Derivative [Line Items]
Gains (loss) on derivative financial instruments	$ 0	$ (20,422)	$ 0	$ (15,763)