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REVENUE - Nature of goods and services (Details) $ in Millions	1 Months Ended
	May 31, 2019 USD ($)	Dec. 31, 2020 USD ($) country	Dec. 31, 2019 USD ($)
REVENUE
Worldwide support organization maintained in number of countries | country		10
Deferred revenue transferred to buyer during sale	$ 22.0
Deferred Service Revenue		$ 8.7	$ 9.2

X

- Definition

Deferred Service Revenue

+ References

No definition available.

+ Details

Name:	aeis_DeferredServiceRevenue
Namespace Prefix:	aeis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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