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Commitments and Contingencies - Warranty Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Total warranty expense	$ 1,975	$ 1,036	$ 5,867	$ 5,191

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- Definition

Product Warranty Expense (Benefit)

+ References

No definition available.

+ Details

Name:	itri_ProductWarrantyExpenseBenefit
Namespace Prefix:	itri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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