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Retirement Benefits - Additional Information (Detail) (Pension Plans, Defined Benefit, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Pension Plans, Defined Benefit
       
Defined Benefit Plans Disclosure [Line Items]        
Defined Benefit Plan, Service Cost $ 26,683 $ 21,000 $ 55,017 $ 42,624
Defined Benefit Plan, Interest Cost 44,920 46,823 87,993 92,739
Defined Benefit Plan, Expected Return on Plan Assets (55,778) (50,101) (105,416) (100,270)
Defined Benefit Plan, Amortization of Prior Service Cost 3,740 3,523 7,228 7,007
Defined Benefit Plan, Amortization of Net Actuarial Loss 52,565 27,046 100,148 52,460
Defined Benefit Plan, Amortization of initial net obligations (assets) 6 (15) 12 (30)
Defined Benefit Plan, Net pension benefit cost $ 72,136 $ 48,276 $ 144,982 $ 94,530