Retirement Benefits - Additional Information (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Pension Plans, Defined Benefit
Defined Benefit Plans Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 24,839	$ 21,350	$ 79,856	$ 63,974
Defined Benefit Plan, Interest Cost	43,329	45,981	131,322	138,720
Defined Benefit Plan, Expected Return on Plan Assets	(52,863)	(50,225)	(158,279)	(150,495)
Defined Benefit Plan, Amortization of Prior Service Cost	3,618	3,505	10,846	10,512
Defined Benefit Plan, Amortization of Net Actuarial Loss	50,347	26,706	150,495	79,166
Defined Benefit Plan, Amortization of initial net obligations (assets)	6	(15)	18	(45)
Defined Benefit Plan, Net pension benefit cost	$ 69,276	$ 47,302	$ 214,258	$ 141,832