Defined Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2013 ExecutiveOfficers
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans	3
Number of 401K Plans	2
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Number of executive officers	3
Number of former executive officers	2
Contribution and benefit payments	$ 264
Additional Contribution to plans	263
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Contribution and benefit payments	3,552
Additional Contribution to plans	$ 3,152

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

Name:	us-gaap_PensionAndOtherPostretirementBenefitContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration