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Subsequent Event (Details) - Oct. 21, 2021 - Subsequent Event $ in Millions	purchase_order	location	MW	USD ($)	facility
Subsequent Event [Line Items]
Number of purchase orders | purchase_order	3
Number of locations		3			3
Battery energy storage capacity | MW			537.5
EPCM agreement, engineering, procurement and construction price | $				$ 892

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- Definition

Battery Energy Storage Capacity

+ References

No definition available.

+ Details

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Namespace Prefix:	amrc_
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- Definition

EPCM Agreement, Engineering, Procurement And Construction Price

+ References

No definition available.

+ Details

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Namespace Prefix:	amrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Number Of Locations

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No definition available.

+ Details

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Namespace Prefix:	amrc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Definition

Number Of Purchase Orders

+ References

No definition available.

+ Details

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Namespace Prefix:	amrc_
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Balance Type:	na
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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