Retirement Benefits - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Special termination cost	$ 7,088	$ 21,174	$ 0
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Estimated amount of net actuarial loss that will be amortized from accumulated other comprehensive (loss) income into net periodic benefit pension cost	200,725
Estimated amount of prior service cost that will be amortized from accumulated other comprehensive (loss) income into net periodic benefit pension cost	6,579
Estimated amount of transition asset that will be amortized from accumulated other comprehensive (loss) income into net periodic benefit pension cost	19
Accumulated benefit obligation for all defined benefit plans	4,884,985	4,451,047
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets	5,211,768	4,761,438
Accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets	4,796,860	4,352,369
Fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets	3,206,287	3,129,803
Projected benefit obligation for pension plans with projected benefit obligations in excess of plan assets	5,310,979	4,821,675
Fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets	3,302,370	3,188,293
Expected cash contributions to defined benefit pension plans in 2012	306,000
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Estimated future benefit payments in the year ending June 30, 2017	239,898
Estimated future benefit payments in the year ending June 30, 2018	220,006
Estimated future benefit payments in the year ending June 30, 2019	224,569
Estimated future benefit payments in the year ending June 30, 2020	248,085
Estimated future benefit payments in the year ending June 30, 2021	272,250
Estimated future benefit payments in the aggregate for the five years ending June 30, 2022 through June 30, 2026	1,381,405
Domestic Defined Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Lump-sum distribution		81,496
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Special termination cost	4,521	$ 0
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Estimated amount of net actuarial loss that will be amortized from accumulated other comprehensive (loss) income into net periodic benefit pension cost	2,101
Estimated amount of prior service cost that will be amortized from accumulated other comprehensive (loss) income into net periodic benefit pension cost	(121)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Estimated future benefit payments in the year ending June 30, 2017	6,216
Estimated future benefit payments in the year ending June 30, 2018	6,796
Estimated future benefit payments in the year ending June 30, 2019	6,717
Estimated future benefit payments in the year ending June 30, 2020	6,349
Estimated future benefit payments in the year ending June 30, 2021	6,287
Estimated future benefit payments in the aggregate for the five years ending June 30, 2022 through June 30, 2026	$ 27,882