v2.4.0.6

Long Term Debt (Parenthetical) (Detail) | 12 Months Ended
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Mar. 31, 2013
Senior Unsecured 3.375% Convertible Notes Due 2038 |
Debt Instrument [Line Items] |
Interest rate of debt instrument | 3.375%
Maturity year | 2038
2011 Credit Facility Due 2016 |
Debt Instrument [Line Items] |
Maturity year | 2016
China Term Loan due 2017 |
Debt Instrument [Line Items] |
Maturity year | 2017
India Term Loan due 2017 |
Debt Instrument [Line Items] |
Maturity year | 2017

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- Definition Debt Instrument Maturity Year + References No definition available. + Details
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Namespace Prefix: | ens_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | instant

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- Definition Debt Instrument Maturity Year + References No definition available. + Details
Name: | ens_DebtInstrumentsMaturityYear
Namespace Prefix: | ens_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration