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Employee Benefit Plans - Summary of Pension Plan Assets as of Measurement Date (Detail) |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Maximum [Member] | Sep. 30, 2012 Equity securities [Member] | Sep. 30, 2011 Equity securities [Member] | Sep. 30, 2012 Equity securities [Member] Minimum [Member] | Sep. 30, 2012 Equity securities [Member] Maximum [Member] | Sep. 30, 2012 Fixed income securities [Member] | Sep. 30, 2011 Fixed income securities [Member] | Sep. 30, 2012 Fixed income securities [Member] Minimum [Member] | Sep. 30, 2012 Fixed income securities [Member] Maximum [Member] | Sep. 30, 2012 Other [Member] | Sep. 30, 2011 Other [Member] | Sep. 30, 2012 Other [Member] Minimum [Member] | Sep. 30, 2012 Other [Member] Maximum [Member]
Asset Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension plan asset allocation, Target |  |  | 100.00% |  |  | 0.00% | 60.00% |  |  | 0.00% | 40.00% |  |  | 0.00% | 100.00%
Pension plan asset allocations | 100.00% | 100.00% |  | 50.00% | 47.00% |  |  | 21.00% | 21.00% |  |  | 29.00% | 32.00% |  |

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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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=21915506&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=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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