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Revenue Recognition Revenue Contract Assets and Liabilities Rollforward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Revenue Recognition and Deferred Revenue [Abstract]
Beginning balance, January 1, 2025	$ 127,557
Revenues recognized from beginning contract liability	(68,350)
Cumulative catch-up adjustments	(2,432)
Increases due to amounts collected or due	261,875
Revenues recognized from current period increases	(153,312)
Other	1,285
Ending balance, September 30, 2025	$ 166,623

X

- Definition

Contract with Customer, Liability, Revenue Recognized From Current Period

+ References

No definition available.

+ Details

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- Definition

Contract with Customer, Other adjustments

+ References

No definition available.

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Namespace Prefix:	itri_
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Balance Type:	credit
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- Definition

Contract with Customer, net

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

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- Definition

Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

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Period Type:	duration

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

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