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Income Taxes - Differences comprising the net deferred taxes shown on consolidated balance sheet (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]      
Retirement benefits $ 340,480 $ 571,022  
Other liabilities and reserves 112,935 144,885  
Long-term contracts 17,496 61,375  
Stock-based compensation 38,535 59,725  
Loss carryforwards 679,880 678,486  
Unrealized currency exchange gains and losses 27,228 22,212  
Inventory (9,612)    
Inventory   17,809  
Foreign tax credit carryforward 0 23,050  
Depreciation and amortization (689,320) (1,080,218)  
Valuation allowance (694,857) (684,079)  
Net deferred tax (liability) (177,235) (185,733)  
Change in net deferred tax asset (liability):      
Provision for deferred tax 41,412 (37,024) $ 65,686
Items of other comprehensive (loss) (65,542) (177,655)  
Acquisitions and other 32,628 (521,814)  
Total change in net deferred tax $ 8,498 $ (736,493)