Equity - Significant reclassifications out of accumulated other comprehensive (loss) in shareholders' equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax	$ (94,842)	$ (141,336)
Amortization of prior service cost and initial net obligation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive (loss)	(6,467)	(8,014)
Recognized actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive (loss)	(147,611)	(214,284)
Retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive (loss)	(154,078)	(222,298)
Tax benefit	51,242	79,930
Net of tax	$ (102,836)	$ (142,368)