Name:	itri_BeneficialOwnership
Namespace Prefix:	itri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

At any time after any person or group becomes an acquiring person, but before a person or group becomes the beneficial owner of more than 50% of the common shares, the Board or Directors may elect to exchange each Right for consideration per Right consisting of one-half of the number of common shares that would be issuable at such time on the exercise of one Right and without payment of the purchase price.

No definition available.

Name:	itri_NumberOfRights
Namespace Prefix:	itri_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Percentage of ownership of common shares

No definition available.

Name:	itri_PercentageOfOwnershipOfCommonShares
Namespace Prefix:	itri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

If, at any time after any person or group becomes an acquiring person, we are acquired in a merger or other business combination with another entity, or if 50% or more of its assets or assets accounting for 50% or more of its net income or revenues are transferred, each Right will entitle its holder to purchase, for the purchase price, that number of shares of common stock of the person or group engaging in the transaction having a then current market value of twice the purchase price.

No definition available.

Name:	itri_PercentageThresholdOfAssetsOfAnyPersonOrGroupThatBecomesAcquiringPerson
Namespace Prefix:	itri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Shares of preferred stock with purchase right for each outstanding share of common stock, without par value.

No definition available.

Name:	itri_PreferredSharePurchaseRightShares
Namespace Prefix:	itri_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The dollar amount that after the distribution date, each Right will entitle the holder to purchase one one-hundredth of a share of Series R Cumulative Participating Preferred Stock of the Company.

No definition available.

Name:	itri_RightExercisePrice
Namespace Prefix:	itri_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Right per unit price

No definition available.