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Commitments and Contingencies (Narratives) (Details) $ in Millions	Sep. 30, 2025 USD ($)
Non-Cancelable Inventory
Commitments And Contingencies [Line Items]
Non-cancelable purchase commitments	$ 48.8

X

- Definition

Commitments And Contingencies.

+ References

No definition available.

+ Details

Name:	extr_CommitmentsAndContingenciesLineItems
Namespace Prefix:	extr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=extr_NonCancelableInventoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: