Employee Benefit Plans - Schedule of Expected Benefit Payments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Pension Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	$ 2,158
2014	2,268
2015	2,372
2016	2,573
2017	2,678
2018-2022	18,087
Supplemental Employee Retirement Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	527
2014	634
2015	621
2016	1,040
2017	1,015
2018-2022	$ 4,646

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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ 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 (f)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

+ Details

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- Definition

Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ References

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- Definition

Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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