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Investments and Fair Value Measurements-Cash and Mkt Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Jan. 01, 2012
Cash, Cash Equivalents and Marketable Securities [Abstract]        
Cash and Cash Equivalents $ 809,003us-gaap_CashAndCashEquivalentsAtCarryingValue $ 986,246us-gaap_CashAndCashEquivalentsAtCarryingValue $ 995,470us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,167,496us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term marketable securities 1,455,509us-gaap_MarketableSecuritiesCurrent 1,919,611us-gaap_MarketableSecuritiesCurrent    
Long-term marketable securities 2,758,475us-gaap_MarketableSecuritiesNoncurrent 3,179,471us-gaap_MarketableSecuritiesNoncurrent    
Total cash, cash equivalents and marketable securities $ 5,022,987sndk_TotalCashAndCashEquivalentsAndMarketableSecurities $ 6,085,328sndk_TotalCashAndCashEquivalentsAndMarketableSecurities