Statements of Consolidated Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income per the statements of consolidated income	$ 24,042	$ 143,993	$ 141,625
Other comprehensive (loss) income, before tax:
Foreign currency translation adjustments	(18,499)	2,021	(8,875)
Post-employment benefits:
Actuarial (loss) gain on re-measurement	(2,192)	(372)	709
Reclassification of actuarial (gains) losses and prior service cost into other income, net and included in net periodic pension costs	(66)	(306)	(73)
Unrealized gain on investment securities available for sale	0	0	37
Cumulative effect of adopting accounting standard	0	(50)	0
Unrealized loss on cash flow hedge	(16,615)	(14,446)	0
Reclassification of interest from cash flow hedge into interest expense	4,638	244	0
Total other comprehensive loss, before tax	(32,734)	(12,909)	(8,202)
Income tax (benefit) expense related to items of other comprehensive loss	(3,190)	(3,246)	319
Other comprehensive loss, net of tax	(29,544)	(9,663)	(8,521)
Comprehensive (loss) income	$ (5,502)	$ 134,330	$ 133,104