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Stockholders' Equity - Textual (Details) (USD $)
3 Months Ended
Mar. 28, 2015
Plan
Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of equity incentive plans 3calx_NumberOfEquityIncentivePlans  
Stock options granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Stock options, weighted average grant date fair value $ 4.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Stock options exercised 84,352us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Weighted-average exercise price per share, stock options $ 6.68us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Unrecognized stock-based compensation expense, stock options $ 7,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions  
Weighted-average amortization period 3 years 3 months  
Taxes paid for awards vested under equity incentive plans 506,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 473,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Weight of historical volatility 50.00%calx_PercentOfHistoricalVolatility  
Weight of implied volatility 50.00%calx_PercentOfImpliedVolatility  
Restricted stock units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average amortization period 2 years 3 months 40 days  
Awards granted 235,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Weighted-average grant date fair value per share $ 9.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Awards vested 1,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Taxes paid for awards vested under equity incentive plans 4,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Unrecognized stock-based compensation expense 10,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Restricted stock awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average amortization period 3 months 22 days  
Awards granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Taxes paid for awards vested under equity incentive plans 31,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Unrecognized stock-based compensation expense 300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Employee stock purchase plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average amortization period 0 years 2 months  
Unrecognized stock-based compensation expense 300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
ESPP, maximum employee payroll deduction percentage 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
ESPP, maximum number of shares per employee 2,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
ESPP, discounted purchase price percentage 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
Shares available for issuance under the ESPP 1,890,983us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
Shares issued under the ESPP 0us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
Performance Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average amortization period 1 year  
Awards granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Taxes paid for awards vested under equity incentive plans 500,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Unrecognized stock-based compensation expense 700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Period of average closing trading price ending on the last day of applicable performance period 90 days  
Period of average closing trading price preceding first day of performance period 90 days  
Shares converted into common stock 147,916calx_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConvertedintoCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Performance Restricted Stock Units | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance period 2 years  
Target performance rate 0.00%calx_TargetPerformanceRate
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Performance Restricted Stock Units | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance period 3 years  
Target performance rate 200.00%calx_TargetPerformanceRate
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Transition And Separation Agreement with Roger Weingarth    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of accelerated stock awards 600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_PlanNameAxis
= calx_TransitionAndSeparationAgreementWithRogerWeingarthMember
 
Fair value recognized for accelerated stock awards $ 100,000calx_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalExpenseRecognized
/ us-gaap_PlanNameAxis
= calx_TransitionAndSeparationAgreementWithRogerWeingarthMember
 
Common Stock | Performance Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of stock issued upon conversion of units 92,359us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember