Net Pension Cost Recognized (Detail) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 21,350	$ 21,139	$ 63,974	$ 63,029
Interest cost	45,981	43,852	138,720	130,697
Expected return on plan assets	(50,225)	(49,196)	(150,495)	(147,130)
Amortization of prior service cost	3,505	3,137	10,512	9,463
Amortization of net actuarial loss	26,706	27,370	79,166	81,529
Amortization of initial net (asset)	(15)	(15)	(45)	(44)
Net benefit cost	$ 47,302	$ 46,287	$ 141,832	$ 137,544