Retirement Benefits - Additional Information (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Pension Plans, Defined Benefit
Defined Benefit Plans Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 27,229	$ 28,334
Defined Benefit Plan, Interest Cost	47,544	43,073
Defined Benefit Plan, Expected Return on Plan Assets	(56,388)	(49,638)
Defined Benefit Plan, Amortization of Prior Service Cost	3,690	3,488
Defined Benefit Plan, Amortization of Net Actuarial Loss	39,418	47,583
Defined Benefit Plan, Amortization of initial net obligations (assets)	5	6
Defined Benefit Plan, Net pension benefit cost	$ 61,498	$ 72,846