v2.4.0.6

Listing of Corporate Headquarters for Sale (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013
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Listing of Corporate Headquarters for Sale [Abstract] |
Listing price of building and land for future sale | $ 13.3
Building and land held for use | $ 15.7

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- Details
Name: | epax_ListingOfCorporateHeadquartersForSaleAbstract
Namespace Prefix: | epax_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The listing price of a building and underlying land that is currently held for use, but listed as for sale in the subsequent period. + References No definition available. + Details
Name: | epax_SubsequentEventBuildingAndLandDisposalListingPrice
Namespace Prefix: | epax_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Discloses the period end amount of plants held for future use and whether such amount is included in the utility's rate base. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PlantHeldForFutureUseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant