Net Pension Cost Recognized (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 21,000	$ 20,020	$ 42,624	$ 41,890
Interest cost	46,823	43,573	92,739	86,845
Expected return on plan assets	(50,101)	(49,201)	(100,270)	(97,934)
Amortization of prior service cost	3,523	3,197	7,007	6,326
Amortization of net actuarial loss	27,046	28,361	52,460	54,159
Amortization of initial net (asset)	(15)	(15)	(30)	(29)
Net benefit cost	$ 48,276	$ 45,935	$ 94,530	$ 91,257