Retirement Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Pension Plans
Defined Benefit Plans Disclosure
Service Cost	$ 23,680	$ 24,506	$ 71,199	$ 74,163
Interest Cost	45,138	44,447	136,872	135,245
Special Termination Cost	0	0	7,088	0
Expected Return on Plan Assets	(55,418)	(54,658)	(166,633)	(164,847)
Amortization of Prior Service Cost	1,868	2,306	5,606	6,903
Amortization of Net Actuarial Loss	42,573	38,171	127,841	114,896
Amortization of initial net obligations (assets)	4	4	12	13
Net pension benefit cost	57,845	54,776	181,985	166,373
Other Postretirement Benefit Plans
Defined Benefit Plans Disclosure
Special Termination Cost			4,521
Net pension benefit cost	$ 1,001	$ 1,019	$ 7,696	$ 3,255