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OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES - Revenue Recognition and Warrant Costs (Details) | 12 Months Ended
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Dec. 31, 2020 country
Worldwide support organization maintained in number of countries | 10
Precision Power Products [Member] | Minimum |
Warranty period | 12 months
Precision Power Products [Member] | Maximum |
Warranty period | 24 months
Inverter Products [Member] | Minimum |
Warranty period | 5 years
Inverter Products [Member] | Maximum |
Warranty period | 10 years
Building [Member] | Inverter Products [Member] | Maximum |
Additional warranty period | 20 years

X
- Definition Additional warranty period of product, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | aeis_AdditionalProductWarrantyPeriod
Namespace Prefix: | aeis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warranty period of product, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | aeis_ProductWarrantyPeriod
Namespace Prefix: | aeis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=aeis_PrecisionPowerProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aeis_InverterProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |