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EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS
Percentage of matching contribution	100.00%	100.00%	50.00%
Percentage of compensation	3.00%	3.00%	6.00%
Percentage of additional match	50.00%	50.00%
Percentage of compensation on additional match	2.00%	2.00%
Defined contribution plan cost	$ 5.1	$ 4.5	$ 3.1

X

- Definition

Percentage of employee's gross for which the employer contributes additional match matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Percentage of employee's gross for which the employer contributes a compensation matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	aeis_
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X

- Definition

Percentage of employee's gross for which the employer contributes additional compensation matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	aeis_
Data Type:	dtr-types:percentItemType
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X

- References

No definition available.

+ Details

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

+ Details

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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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