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Business Acquisition Business Acquisition - Fair Value of Intangible Assets (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Unclassified Indefinite-lived Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Indefinite-lived Intangible Assets $ 61,000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
$ 42,500us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
SMART Storage Systems [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   3 years 10 months
IPR&D   6,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree5Member
Business Combination, Finite-lived and Infinite-lived Intangible Assets Acquired   168,500sndk_BusinessCombinationFinitelivedandInfinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree5Member
SMART Storage Systems [Member] | Unclassified Indefinite-lived Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Indefinite-lived Intangible Assets   6,300us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree5Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
SMART Storage Systems [Member] | Developed product technology [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   4 years 0 months
Finite-lived Intangible Assets Acquired   146,100us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree5Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
SMART Storage Systems [Member] | Trademarks and Trade Names [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   4 years 0 months
Finite-lived Intangible Assets Acquired   8,500us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree5Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
SMART Storage Systems [Member] | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   2 years 0 months
Finite-lived Intangible Assets Acquired   7,600us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree5Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Fusion-io Inc [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 6 months  
IPR&D 61,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree6Member
 
Business Combination, Finite-lived and Infinite-lived Intangible Assets Acquired 443,000sndk_BusinessCombinationFinitelivedandInfinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree6Member
 
Fusion-io Inc [Member] | Unclassified Indefinite-lived Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Indefinite-lived Intangible Assets 61,000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree6Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
 
Fusion-io Inc [Member] | Developed product technology [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years 0 months  
Finite-lived Intangible Assets Acquired 271,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree6Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Fusion-io Inc [Member] | Trademarks and Trade Names [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years 0 months  
Finite-lived Intangible Assets Acquired 54,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree6Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
 
Fusion-io Inc [Member] | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 1 year 6 months  
Finite-lived Intangible Assets Acquired $ 57,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sndk_BusinessAcquisitionAcquiree6Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember