Retirement Benefits - Additional Information (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Pension Plans, Defined Benefit
Defined Benefit Plans Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 28,334	$ 21,624
Defined Benefit Plan, Interest Cost	43,073	45,916
Defined Benefit Plan, Expected Return on Plan Assets	(49,638)	(50,169)
Defined Benefit Plan, Amortization of Prior Service Cost	3,488	3,484
Defined Benefit Plan, Amortization of Net Actuarial Loss	47,583	25,414
Defined Benefit Plan, Amortization of initial net obligations (assets)	6	(15)
Defined Benefit Plan, Net pension benefit cost	$ 72,846	$ 46,254