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Fair Values by Asset Category of Defined Benefit Pension Plan (Parenthetical) (Detail) | Jun. 30, 2013 | Jun. 30, 2012
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Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 100.00% | 100.00%
Large Cap Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 76.00% |
Emerging Markets Equity Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 7.00% |
International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 17.00% |
Short Term Fixed Income Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 12.00% |
High Yield Fixed Income Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 9.00% |
Intermediate Fixed Income Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 44.00% |
REITs and MLPs Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 27.00% |
Hedge Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocation | 8.00% |

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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