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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Cash flows from operating activities:      
Net income (loss) $ 82us-gaap_NetIncomeLoss $ (32,254)us-gaap_NetIncomeLoss $ (320,259)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 65,477us-gaap_DepreciationAndAmortization 71,432us-gaap_DepreciationAndAmortization 64,535us-gaap_DepreciationAndAmortization
Stock-based compensation 23,181us-gaap_ShareBasedCompensation 26,264us-gaap_ShareBasedCompensation 26,315us-gaap_ShareBasedCompensation
Unrealized foreign exchange (loss) gain , net (5,846)us-gaap_ForeignCurrencyTransactionGainLossUnrealized (2,251)us-gaap_ForeignCurrencyTransactionGainLossUnrealized 1,747us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Net amortization of premiums and accrued interest on investments 718us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 1,580us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 5,101us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Asset impairments 770us-gaap_AssetImpairmentCharges 2,966us-gaap_AssetImpairmentCharges 1,759us-gaap_AssetImpairmentCharges
Loss on disposal of property and equipment 4us-gaap_GainLossOnSaleOfPropertyPlantEquipment 6us-gaap_GainLossOnSaleOfPropertyPlantEquipment  
Gain on investment securities and other investments (131)us-gaap_GainLossOnSaleOfSecuritiesNet (1,796)us-gaap_GainLossOnSaleOfSecuritiesNet (1,508)us-gaap_GainLossOnSaleOfSecuritiesNet
Accrued interest on short-term loan 350us-gaap_IncreaseDecreaseInInterestPayableNet    
Excess tax benefits from stock option transactions   (842)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (14,232)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Impairment of goodwill and purchased intangible assets     274,637pmcs_ImpairmentOfGoodwillAndPurchasedIntangibleAssets
Taxes related to intercompany dividend     60,940pmcs_TaxesRelatedToIntercompanyDividend
Changes in operating assets and liabilities:      
Accounts receivable, net 666us-gaap_IncreaseDecreaseInAccountsReceivable 6,330us-gaap_IncreaseDecreaseInAccountsReceivable (2,929)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net (6,875)us-gaap_IncreaseDecreaseInInventories (3,625)us-gaap_IncreaseDecreaseInInventories 17,294us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 1,278us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 1,315us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 2,635us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued liabilities 878us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (5,551)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (28,267)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred income taxes and income taxes receivables/payables 12,973us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable 15,900us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable (21,085)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Deferred income (2,951)us-gaap_IncreaseDecreaseInDeferredRevenue (632)us-gaap_IncreaseDecreaseInDeferredRevenue (7,911)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by operating activities 90,574us-gaap_NetCashProvidedByUsedInOperatingActivities 78,842us-gaap_NetCashProvidedByUsedInOperatingActivities 58,772us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Investment in long term deposits   (1,127)us-gaap_PaymentsToAcquireRestrictedInvestments  
Cash paid in connection with business acquisition, net of cash acquired (10,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (96,098)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (15,900)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Purchases of property and equipment (13,945)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (16,851)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (31,229)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of intangible assets (1,437)us-gaap_PaymentsToAcquireIntangibleAssets (3,979)us-gaap_PaymentsToAcquireIntangibleAssets (7,438)us-gaap_PaymentsToAcquireIntangibleAssets
Redemption of short-term investments 5,670us-gaap_ProceedsFromSaleOfShortTermInvestments 8,466us-gaap_ProceedsFromSaleOfShortTermInvestments 26,473us-gaap_ProceedsFromSaleOfShortTermInvestments
Disposals of investment securities 61,695us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 162,773us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 315,310us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchases of investment securities and other investments (106,076)us-gaap_PaymentsToAcquireMarketableSecurities (179,837)us-gaap_PaymentsToAcquireMarketableSecurities (120,917)us-gaap_PaymentsToAcquireMarketableSecurities
Net cash (used in) provided by investing activities (64,093)us-gaap_NetCashProvidedByUsedInInvestingActivities (126,653)us-gaap_NetCashProvidedByUsedInInvestingActivities 166,299us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Proceeds from credit facility 30,000us-gaap_ProceedsFromShortTermDebt 30,000us-gaap_ProceedsFromShortTermDebt  
Payment of debt issuance costs   (928)us-gaap_PaymentsOfDebtIssuanceCosts  
Repurchase of senior convertible notes     (68,340)pmcs_PaymentsForRepurchaseOfConvertibleDebt
Repurchases of common stock (11,496)us-gaap_PaymentsForRepurchaseOfCommonStock (76,335)us-gaap_PaymentsForRepurchaseOfCommonStock (199,999)us-gaap_PaymentsForRepurchaseOfCommonStock
Repayment of credit facility (60,000)us-gaap_RepaymentsOfShortTermDebt    
Proceeds from issuance of common stock 29,175us-gaap_ProceedsFromIssuanceOfCommonStock 25,247us-gaap_ProceedsFromIssuanceOfCommonStock 16,000us-gaap_ProceedsFromIssuanceOfCommonStock
Excess tax benefits from stock option transactions   842us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation 14,232us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation
Net cash used in financing activities (12,321)us-gaap_NetCashProvidedByUsedInFinancingActivities (21,174)us-gaap_NetCashProvidedByUsedInFinancingActivities (238,107)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (1,628)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (947)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 435us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 12,532us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (69,932)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (12,601)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 100,038us-gaap_CashAndCashEquivalentsAtCarryingValue 169,970us-gaap_CashAndCashEquivalentsAtCarryingValue 182,571us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 112,570us-gaap_CashAndCashEquivalentsAtCarryingValue 100,038us-gaap_CashAndCashEquivalentsAtCarryingValue 169,970us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:      
Cash paid for interest 348us-gaap_InterestPaidNet 42us-gaap_InterestPaidNet 1,554us-gaap_InterestPaidNet
Cash paid for income taxes, net of refunds received (1,781)us-gaap_ProceedsFromIncomeTaxRefunds (1,338)us-gaap_ProceedsFromIncomeTaxRefunds (2,523)us-gaap_ProceedsFromIncomeTaxRefunds
Supplemental disclosures of non-cash investing and financing activities:      
Conversion of PMC-Sierra special shares into common stock $ 10pmcs_ConversionOfSpecialSharesToCommonStock   $ 40pmcs_ConversionOfSpecialSharesToCommonStock