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Share-Based Compensation-Plan Info (Details Textuals 2) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost 10.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost    
2013 Incentive Plan [Member]      
Stock Plan Summary      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 20,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sndk_A2013IncentivePlanMember
   
Additional Common Stock Added to Reserve Kept for Incentive Plan 762,444sndk_AdditionalCommonStockAddedToReserveKeptForIncentivePlan
/ us-gaap_PlanNameAxis
= sndk_A2013IncentivePlanMember
   
Maximum number of shares by which share reserve can be increased for issuance under incentive plan 10,000,000sndk_MaximumNumberOfSharesByWhichShareReserveCanBeIncreasedForIssuanceUnderIncentivePlan
/ us-gaap_PlanNameAxis
= sndk_A2013IncentivePlanMember
   
Share-based Award Vesting Term P7Y    
2005 Incentive Plan [Member]      
Stock Plan Summary      
Stock Plan Termination Date Jun. 12, 2013    
Share-based Award Vesting Term P7Y    
1995 Incentive Plan [Member]      
Stock Plan Summary      
Stock Plan Termination Date May 27, 2005    
Share-based Award Vesting Term P10Y    
2005 Employee Stock Purchase Plan [Member]      
Stock Plan Summary      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 10,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sndk_EmployeeStockPurchasePlanMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,706,401us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sndk_EmployeeStockPurchasePlanMember
   
Stock Purchase Plan Activity      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 639,265us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= sndk_EmployeeStockPurchasePlanMember
623,887us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= sndk_EmployeeStockPurchasePlanMember
684,646us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= sndk_EmployeeStockPurchasePlanMember
Purchase price of common stock under Employee stock purchase plan as a percentage of fair market value of share 85.00%sndk_PurchasePriceOfCommonStockUnderEmployeeStockPurchasePlanAsPercentageOfFairMarketValueOfShare
/ us-gaap_PlanNameAxis
= sndk_EmployeeStockPurchasePlanMember