v2.4.0.8

Subsequent Event (Details) (Subsequent Event [Member], USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended
--- | ---
Nov. 04, 2014
Subsequent Event [Member] |
Subsequent Event [Line Items] |
Stock Repurchased and Retired During Period, Shares | 80,500
Stock Repurchased and Retired During Period, Average Price Per Share | $ 38.20
Expected Pre-tax Restructuring Charge, Lower Range | $ 65
Expected Pre-tax Restructuring Charge, Upper Range | $ 75
Percentage of Restructuring Charge due to Closing or Consolidating Facilities | 20.00%
Percentage of Restructuring Charge due to Employee Severance Costs | 80.00%
Percentage of Restructuring Charge Resulting in Cash Expenditure | 90.00%

X
- Definition Expected Pre-tax Restructuring Charge, Lower Range + References No definition available. + Details
Name: | itri_ExpectedPretaxRestructuringChargeLowerRange
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Expected Pre-tax Restructuring Charge, Upper Range + References No definition available. + Details
Name: | itri_ExpectedPretaxRestructuringChargeUpperRange
Namespace Prefix: | itri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of restructuring charge due to closing or consolidating facilities + References No definition available. + Details
Name: | itri_PercentageofRestructuringChargeduetoClosingorConsolidatingFacilities
Namespace Prefix: | itri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Restructuring Charge due to Employee Severance Costs + References No definition available. + Details
Name: | itri_PercentageofRestructuringChargeduetoEmployeeSeveranceCosts
Namespace Prefix: | itri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Restructuring Charge Resulting in Cash Expenditure + References No definition available. + Details
Name: | itri_PercentageofRestructuringChargeResultinginCashExpenditure
Namespace Prefix: | itri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stock Repurchased and Retired During Period, Average Price Per Share + References No definition available. + Details
Name: | itri_StockRepurchasedAndRetiredDuringPeriodAveragePricePerShare
Namespace Prefix: | itri_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration