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EQUITY AWARD PLAN (Additional Information) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
plan
Dec. 31, 2013
Nov. 16, 2012
Share-based Compensation Arrangement by Share-based Payment Award      
Number of equity incentive plans 2rkus_ShareBasedCompensationArrangementBySharebasedPaymentAwardNumberOfPlans    
2012 Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Expiration period 10 years    
Number of shares authorized under plan 32,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= rkus_A2012PlanMember
   
Increase in number of shares reserved for issuance on the first day of fiscal year, as a percentage of shares of common stock on the last day of preceding fiscal year 5.00%rkus_CommonStockIncreaseInCapitalSharesReservedForFutureIssuanceInPeriodAsAPercent
/ us-gaap_PlanNameAxis
= rkus_A2012PlanMember
   
Shares reserved for future issuance 29,300,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= rkus_A2012PlanMember
29,200,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= rkus_A2012PlanMember
 
2012 Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period for equity awards 1 year    
2012 Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period for equity awards 4 years    
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award      
Number of shares authorized under plan 3,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
2,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
 
Shares reserved for future issuance     1,500,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
Offering period 1 year    
Purchase period 6 months    
Maximum percent of employee salary that can purchase stock 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
   
Purchase price of common stock, as a percent 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
   
Maximum value of stock purchased per employee 25,000rkus_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesPerEmployeeValue
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
   
Maximum number of shares purchased by each employee 2,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
   
Average exercise price 8.91rkus_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeStockPurchasePlanGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
   
ESPP | Scenario (i) ESPP shares reserved for issuance      
Share-based Compensation Arrangement by Share-based Payment Award      
Increase in number of shares reserved for issuance on the first day of fiscal year, as a percentage of shares of common stock on the last day of preceding fiscal year 2.00%rkus_CommonStockIncreaseInCapitalSharesReservedForFutureIssuanceInPeriodAsAPercent
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
/ us-gaap_StatementScenarioAxis
= rkus_ScenarioOneMember
   
ESPP | Scenario (ii) ESPP shares reserved for issuance      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares reserved for future issuance 3,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= rkus_EmployeeStockPurchasePlanEsppMember
/ us-gaap_StatementScenarioAxis
= rkus_ScenarioTwoMember
   
Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 482,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
345,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember