Retirement Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Pension Plans
Defined Benefit Plans Disclosure
Service Cost		$ 47,339	$ 47,519
Interest Cost		61,468	91,734
Special Termination Cost	$ 7,088
Expected Return on Plan Assets		(117,797)	(111,215)
Amortization of Prior Service Cost		3,399	3,738
Amortization of Net Actuarial Loss		105,752	85,268
Amortization of initial net obligation		10	8
Net pension benefit cost		100,171	124,140
Other Postretirement Benefit Plans
Defined Benefit Plans Disclosure
Special Termination Cost	$ 4,521
Net pension benefit cost		$ 2,232	$ 6,695