The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph g

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified		12 Months Ended
	Sep. 30, 2012 Plans	Sep. 30, 2012 K 401 Plan [Member]	Sep. 30, 2011 K 401 Plan [Member]	Sep. 30, 2010 K 401 Plan [Member]	Sep. 30, 2013 Pension Plans [Member] Subsequent Event	Sep. 30, 2013 Supplemental Employee Retirement Plan [Member] Subsequent Event
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of defined benefit pension plans	3
Defined Contribution Plan	2
Contribution to pension plans		$ 1,378	$ 1,301	$ 1,131
Additional Contribution to pension plans					$ 4,510	$ 527