Income Taxes - Differences comprising the net deferred taxes shown on consolidated balance sheet (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Retirement benefits	$ 368,269	$ 340,480
Other liabilities and reserves	104,850	112,935
Long-term contracts	22,241	17,496
Stock-based compensation	38,730	38,535
Loss carryforwards	792,914	679,880
Unrealized currency exchange gains and losses	27,034	27,228
Inventory	5,540	6,696
Foreign tax credit carryforward	1,726
Undistributed foreign earnings	(16,762)	(16,308)
Depreciation and amortization	(589,454)	(689,320)
Valuation allowance	(797,692)	(694,857)
Net deferred tax (liability)	(42,604)	(177,235)
Change in net deferred tax (liability):
Provision for deferred tax	(32,537)	41,412	$ (37,024)
Items of other comprehensive income (loss)	72,530	(65,542)
Acquisitions and other	94,638	32,628
Total change in net deferred tax	$ 134,631	$ 8,498

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on foreign currency transactions.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences.

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The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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