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Restructuring and Other Charges (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve $ 6,210us-gaap_RestructuringReserve $ 14,224us-gaap_RestructuringReserve $ 4,343us-gaap_RestructuringReserve $ 5,027us-gaap_RestructuringReserve
Accounts payable and accrued liabilities [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve 5,775us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember		      
Other long-term liabilities [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve $ 435us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= cdns_OtherLongTermLiabilitiesMember