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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Fair value information related to assets
Assets	$ 31,951
Other mutual funds [Member]
Fair value information related to assets
Assets	1,277
Money market funds [Member]
Fair value information related to assets
Assets	30,674
Quoted Prices in Active Markets (Level 1) [Member]
Fair value information related to assets
Assets	31,951
Quoted Prices in Active Markets (Level 1) [Member] | Other mutual funds [Member]
Fair value information related to assets
Assets	1,277
Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member]
Fair value information related to assets
Assets	30,674
Significant Other Observable Inputs (Level 2) [Member]
Fair value information related to assets
Assets
Significant Other Observable Inputs (Level 2) [Member] | Other mutual funds [Member]
Fair value information related to assets
Assets
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]
Fair value information related to assets
Assets
Significant Unobserved Inputs (Level 3) [Member]
Fair value information related to assets
Assets
Significant Unobserved Inputs (Level 3) [Member] | Other mutual funds [Member]
Fair value information related to assets
Assets
Significant Unobserved Inputs (Level 3) [Member] | Money market funds [Member]
Fair value information related to assets
Assets

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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

X

- Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration