Retirement Benefits - Assumptions Used to Determine Benefit Obligations and Net periodic Pension and Postretirement Benefit Costs (Detail)	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Compensation And Retirement Disclosure [Abstract]
Benefit obligation discount rates for pension plans, minimum	1.40%	0.60%	4.70%
Benefit obligation rates of compensation increase for pension plans, minimum	0.00%	0.00%	2.50%
Net periodic discount rates for pension plans, minimum	0.60%	4.70%	4.10%
Net periodic rates of compensation increase for pension plans, minimum	0.00%	0.00%	2.50%
Benefit obligation discount rates for pension plans, maximum	4.40%	5.00%	5.90%
Benefit obligation rates of compensation increase for pension plans, maximum	4.00%	4.00%	4.00%
Net periodic discount rates for pension plans, maximum	5.00%	5.90%	5.60%
Net periodic rates of compensation increase for pension plans, maximum	4.00%	4.00%	4.00%

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