Retirement Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Pension Plans
Defined Benefit Plans Disclosure
Service Cost	$ 24,223	$ 24,113
Interest Cost	31,496	46,071
Expected Return on Plan Assets	(57,617)	(55,649)
Amortization of Prior Service Cost	1,716	2,069
Amortization of Net Actuarial Loss	51,427	42,969
Amortization of initial net obligation	5	4
Net pension benefit cost	51,250	59,577
Other Postretirement Benefit Plans
Defined Benefit Plans Disclosure
Net pension benefit cost	$ 1,116	$ 1,087