Financial Instruments - (Losses) gains on derivative and non-derivative financial instruments that were recorded in accumulated other comprehensive (loss) (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cross-currency swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in accumulated other comprehensive (loss) on derivatives and non-derivatives	$ (9,435)	$ 13,723
Foreign denominated debt
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in accumulated other comprehensive (loss) on derivatives and non-derivatives	$ 7,205	$ 16,458