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GOODWILL AND INTANGIBLES ASSETS (Intangible Assets) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 18, 2013
Schedule of Intangible Assets [Line Items]        
Accumulated amortization   $ (2,929,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization    
Finite-lived intangible assets, net 7,351,000us-gaap_FiniteLivedIntangibleAssetsNet      
Intangible Assets, Gross   12,600,000rkus_IntangibleAssetsGross    
Intangible assets, net 7,351,000us-gaap_IntangibleAssetsNetExcludingGoodwill 9,671,000us-gaap_IntangibleAssetsNetExcludingGoodwill    
In-process research and development        
Schedule of Intangible Assets [Line Items]        
Indefinite-lived intangible assets   6,000,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
   
In-process research and development | YFind        
Schedule of Intangible Assets [Line Items]        
Indefinite-lived intangible assets       6,000,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= rkus_YFindMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
Purchased technology        
Schedule of Intangible Assets [Line Items]        
Gross Carrying Amount 12,600,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
6,600,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
   
Accumulated amortization (5,249,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
(2,929,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
   
Finite-lived intangible assets, net 7,351,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
3,671,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
   
Weighted average remaining useful life 2 years 10 months 2 years 10 months    
Amortization of Intangible Assets $ 2,300,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
$ 1,300,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
$ 1,300,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember