Retirement Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Pension Plans
Defined Benefit Plans Disclosure
Service Cost	$ 23,406	$ 24,583	$ 47,519	$ 49,657
Interest Cost	45,663	44,305	91,734	90,798
Special Termination Cost	7,088	0	7,088	0
Expected Return on Plan Assets	(55,566)	(54,961)	(111,215)	(110,189)
Amortization of Prior Service Cost	1,669	1,927	3,738	4,597
Amortization of Net Actuarial Loss	42,299	37,297	85,268	76,725
Amortization of initial net obligations (assets)	4	4	8	9
Net pension benefit cost	64,563	53,155	124,140	111,597
Other Postretirement Benefit Plans
Defined Benefit Plans Disclosure
Special Termination Cost	4,521
Net pension benefit cost	$ 5,608	$ 1,118	$ 6,695	$ 2,236