Equity - Significant reclassifications out of accumulated other comprehensive (loss) in shareholders' equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income	$ (222,298)	$ (178,703)
Tax benefit, retirement benefit plans	79,930	64,694
Net of tax	(142,368)	(114,009)
Amortization of prior service cost and initial net obligation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income	(8,014)	(7,366)
Recognized actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income	$ (214,284)	$ (171,337)