Defined Benefit Pension Plan's Weighted Average Asset Allocation and Weighted Average Target Allocation (Detail)	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	100.00%	100.00%
Weighted average target allocation	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	48.00%	54.00%
Weighted average target allocation	46.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	46.00%	40.00%
Weighted average target allocation	49.00%
Commodity Contract
Defined Benefit Plan Disclosure [Line Items]
Weighted average target allocation	2.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	6.00%	6.00%
Weighted average target allocation	3.00%