Statements of Consolidated Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income per the statements of consolidated income	$ 143,993	$ 141,625	$ 133,910
Other comprehensive (loss) income, before tax:
Foreign currency translation adjustments	2,021	(8,875)	2,238
Post-employment benefits:
Actuarial (loss) gain on re-measurement	(372)	709	2,038
Reclassification of actuarial (gains) losses and prior service cost into other income, net and included in net periodic pension costs	(306)	(73)	506
Unrealized gain on investment securities available for sale	0	37	91
Cumulative effect of adopting accounting standard	(50)	0	0
Unrealized loss on cash flow hedge	(14,446)	0	0
Reclassification of interest from cash flow hedge into interest expense	244	0	0
Total other comprehensive (loss) income, before tax	(12,909)	(8,202)	4,873
Income tax (benefit) expense related to items of other comprehensive income (loss)	(3,246)	319	1,029
Other comprehensive (loss) income, net of tax	(9,663)	(8,521)	3,844
Comprehensive income	$ 134,330	$ 133,104	$ 137,754