Financial Instruments - Gains (losses) 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, 2019	Jun. 30, 2018
Cross-currency swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive (loss) on derivatives and non-derivatives	$ 13,723	$ (9,209)
Foreign denominated debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive (loss) on derivatives and non-derivatives	$ 16,458	$ (9,543)