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Cash, Cash Equivalents and Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Mar. 29, 2014
Dec. 28, 2013
Classified as cash and cash equivalents        
Cash and interest bearing deposits $ 209,310cdns_CashAndInterestBearingDeposits $ 203,665cdns_CashAndInterestBearingDeposits    
Money market funds 678,426us-gaap_MoneyMarketFundsAtCarryingValue 728,496us-gaap_MoneyMarketFundsAtCarryingValue    
Total cash and cash equivalents $ 887,736us-gaap_CashAndCashEquivalentsAtCarryingValue $ 932,161us-gaap_CashAndCashEquivalentsAtCarryingValue $ 532,761us-gaap_CashAndCashEquivalentsAtCarryingValue $ 536,260us-gaap_CashAndCashEquivalentsAtCarryingValue