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Income Taxes Income Taxes - Deferred Tax Assets (Liabilities) (Details 4) (USD $)
Dec. 28, 2014
Dec. 29, 2013
Deferred tax assets:    
Deferred income on shipments to distributors and retailers and deferred revenue recognized for tax purposes $ 65,002,000us-gaap_DeferredTaxAssetsDeferredIncome $ 68,117,000us-gaap_DeferredTaxAssetsDeferredIncome
Accruals and reserves not currently deductible 98,342,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 63,236,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Depreciation and amortization not currently deductible 96,735,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 81,245,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deductible share-based compensation 32,679,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 28,684,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Unrealized loss on investments 10,045,000sndk_DeferredTaxAssetsUnrealizedLossesOnInvestments 13,620,000sndk_DeferredTaxAssetsUnrealizedLossesOnInvestments
Unrealized foreign exchange loss 10,357,000us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 8,061,000us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses
Net operating loss carryforwards 196,809,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 36,422,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carryforwards 61,134,000us-gaap_TaxCreditCarryforwardDeferredTaxAsset 37,905,000us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Other 22,100,000us-gaap_DeferredTaxAssetsOther 24,667,000us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 593,203,000us-gaap_DeferredTaxAssetsGross 361,957,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (96,128,000)us-gaap_DeferredTaxAssetsValuationAllowance (52,105,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance 497,075,000us-gaap_DeferredTaxAssetsNet 309,852,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Acquired intangible assets (146,955,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (2,701,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Unrealized gain on investments (2,007,000)sndk_UnrealizedGainOnInvestments (5,939,000)sndk_UnrealizedGainOnInvestments
Unrealized foreign exchange gain 0us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains (3,127,000)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
U.S. taxes provided on unremitted earnings of foreign subsidiaries (28,844,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (28,844,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Total deferred tax liabilities (177,806,000)us-gaap_DeferredTaxLiabilities (40,611,000)us-gaap_DeferredTaxLiabilities
Net deferred tax assets $ 319,269,000us-gaap_DeferredTaxAssetsLiabilitiesNet $ 269,241,000us-gaap_DeferredTaxAssetsLiabilitiesNet