v2.4.0.6

Charges Related to Refinancing (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

X
- 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

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