Retirement Benefits - Additional Information (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit
Defined Benefit Plans Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 22,457	$ 26,683	$ 49,686	$ 55,017
Defined Benefit Plan, Interest Cost	47,465	44,920	95,009	87,993
Defined Benefit Plan, Expected Return on Plan Assets	(56,574)	(55,778)	(112,962)	(105,416)
Defined Benefit Plan, Amortization of Prior Service Cost	2,204	3,740	5,894	7,228
Defined Benefit Plan, Amortization of Net Actuarial Loss	40,261	52,565	79,679	100,148
Defined Benefit Plan, Amortization of initial net obligations (assets)	5	6	10	12
Defined Benefit Plan, Net pension benefit cost	$ 55,818	$ 72,136	$ 117,316	$ 144,982