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Leases - Additional Information (Details)	1 Months Ended
	Mar. 31, 2023 MW
Lancaster Power Purchase Agreement [Member]
Lessee, Lease, Description [Line Items]
Evaluated Power Capacity	270

X

- Definition

Evaluated Power Capacity

+ References

No definition available.

+ Details

Name:	ava_EvaluatedPowerCapacity
Namespace Prefix:	ava_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=ava_LancasterPowerPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: