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Retirement Benefits (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Pension Plans    
Defined Benefit Plans Disclosure    
Service Cost $ 24,113 $ 25,074
Interest Cost 46,071 46,493
Expected Return on Plan Assets (55,649) (55,228)
Amortization of Prior Service Cost 2,069 2,670
Amortization of Net Actuarial Loss 42,969 39,428
Amortization of initial net obligations (assets) 4 5
Net pension benefit cost 59,577 58,442
Other Postretirement Benefit Plans    
Defined Benefit Plans Disclosure    
Net pension benefit cost $ 1,087 $ 1,118