v3.7.0.1

Derivative Financial Instruments - Additional Information (Detail) $ in Thousands, lb in Millions	12 Months Ended
	Mar. 31, 2017 USD ($) lb	Mar. 31, 2016 USD ($) lb
Derivatives, Fair Value [Line Items]
Foreign currency contract, maturity	1 year
Cost of Sales
Derivatives, Fair Value [Line Items]
Derivative gain (loss) to be recorded in income within 12 months, before tax	$ (3,118)
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Hedge forward contracts, maturity	1 year
Derivative, nonmonetary notional amount, mass | lb	45.0	27.4
Designated as Hedging Instrument | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	$ 30,751	$ 18,206
Not Designated as Hedging Instrument | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	$ 13,560	$ 11,156

X

- Definition

Hedging Derivatives, Maturity, Upper Limit

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Maximum Term for Foreign Currency Forward Exchange Contracts

+ References

No definition available.

+ Details

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Namespace Prefix:	ens_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:massItemType
Balance Type:	na
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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

+ Details

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- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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X

- Details

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