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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
	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

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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.

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