v2.4.0.6

Other Income Expense Net and Charges Related to Refinancing - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2011 | Mar. 31, 2010
Components of Other Income (Expense) [Line Items] |  |
Charges related to refinancing | $ 8,155 | $ 8,155
Write-offs of deferred financing fees | 2,308 |
Interest rate swap agreements, losses from discontinued hedging accounting | $ 5,847 |

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- Definition Charges related to refinancing. + References No definition available. + Details
Name: | ens_ChargesRelatedToRefinancing
Namespace Prefix: | ens_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ens_ComponentsOfOtherIncomeExpenseLineItems
Namespace Prefix: | ens_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate swap agreements, losses from discontinued hedging accounting. + References No definition available. + Details
Name: | ens_InterestRateSwapAgreementsLossesFromDiscontinuedHedgingAccounting
Namespace Prefix: | ens_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration