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Cash, Cash Equivalents and Marketable Securities (Details) (USD $)
Mar. 28, 2015
Dec. 31, 2014
Mar. 29, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 29,618,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 48,829,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 75,169,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 82,747,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 68,157,000us-gaap_AvailableForSaleSecurities 62,850,000us-gaap_AvailableForSaleSecurities    
Total cash, cash equivalents and marketable securities 97,775,000calx_CashCashEquivalentsAndMarketableSecurities 111,679,000calx_CashCashEquivalentsAndMarketableSecurities    
Available-for-sale securities in a continuous unrealized loss position in excess of twelve months 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss    
Corporate debt securities        
Cash and Cash Equivalents [Line Items]        
Marketable securities 63,063,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
61,050,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Commercial paper        
Cash and Cash Equivalents [Line Items]        
Marketable securities 5,094,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember
1,800,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember
   
Cash        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 13,838,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
17,866,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
   
Money market funds        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 15,780,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
$ 30,963,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember