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Assumptions Used to Measure Net Periodic Benefit Cost for Postretirement Benefit Obligations (Detail) (Other Postretirement Benefit Plans, Defined Benefit)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Other Postretirement Benefit Plans, Defined Benefit
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	5.00%	5.01%	6.10%
Current medical cost trend rate	8.00%	8.00%	8.50%
Ultimate medical cost trend rate	5.00%	5.00%	5.00%
Medical cost trend rate decreases to ultimate in year	2019	2018	2018

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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