v2.4.0.6

Listing of Corporate Headquarters for Sale (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
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

X

- Details

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

X

- 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

X

- 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

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