Income Taxes - Differences comprising the net deferred taxes shown on consolidated balance sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Retirement benefits	$ 571,022	$ 815,545
Other liabilities and reserves	144,885	126,524
Long-term contracts	61,375	64,371
Stock-based compensation	59,725	67,138
Loss carryforwards	678,486	326,707
Unrealized currency exchange gains and losses	22,212
Unrealized currency exchange gains and losses		(19,491)
Inventory	17,809	14,693
Foreign tax credit carryforward	23,050	24,051
Depreciation and amortization	(1,080,218)	(536,070)
Valuation allowance	(684,079)	(332,708)
Net deferred tax (liability) asset	(185,733)
Net deferred tax (liability) asset		550,760
Change in net deferred tax asset:
Provision for deferred tax	(37,024)	65,686	$ (18,865)
Items of other comprehensive (loss)	(177,655)	149,861
Acquisitions and other	(521,814)	(7,832)
Total change in net deferred tax	$ (736,493)	$ 207,715