v3.7.0.1

Debt - Long Term Debt (Phantom) (Detail)	12 Months Ended
	Mar. 31, 2017	Apr. 23, 2015
Senior Unsecured 3.375% Convertible Notes Due 2038
Debt Instrument [Line Items]
Interest rate of debt instrument	3.375%	3.375%
Maturity year	2038
2011 Credit Facility Due 2018
Debt Instrument [Line Items]
Maturity year	2018

X

- Definition

Debt Instrument Maturity Year

+ References

No definition available.

+ Details

Name:	ens_DebtInstrumentMaturityYear
Namespace Prefix:	ens_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=ens_SeniorUnsecuredThreePointThreeSevenFivePercentageConvertibleNotesDueTwoThousandAndThirtyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=ens_TwoThousandAndElevenCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: