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Supplemental Financial Information (Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Gross 570,353us-gaap_FiniteLivedIntangibleAssetsGross 508,615us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (426,673)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (361,641)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Net 143,680us-gaap_IntangibleAssetsNetExcludingGoodwill 146,974us-gaap_IntangibleAssetsNetExcludingGoodwill
Core Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Gross 246,961us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_CoreTechnologyMember		 245,661us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_CoreTechnologyMember
Accumulated Amortization (189,014)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_CoreTechnologyMember		 (173,772)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_CoreTechnologyMember
Intangible Assets, Net 57,947us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_CoreTechnologyMember		 71,889us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_CoreTechnologyMember
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Gross 102,106us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 98,306us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (85,455)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 (76,591)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Intangible Assets, Net 16,651us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 21,715us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Existing Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Gross 109,700us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_ExistingTechnologyMember		 69,900us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_ExistingTechnologyMember
Accumulated Amortization (65,859)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_ExistingTechnologyMember		 (50,126)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_ExistingTechnologyMember
Intangible Assets, Net 43,841us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_ExistingTechnologyMember		 19,774us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= pmcs_ExistingTechnologyMember
Developed Technology Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Gross 70,240us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 68,802us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Accumulated Amortization (61,854)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 (55,442)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Intangible Assets, Net 8,386us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember		 13,360us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
In-Process Research And Development [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Gross 16,746us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1] 16,746us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1]
Accumulated Amortization (5,396)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1] (2,853)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1]
Intangible Assets, Net 11,350us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1] 13,893us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		 [1]
Trademarks [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible Assets, Gross 24,600us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember		 9,200us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Accumulated Amortization (19,095)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember		 (2,857)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Intangible Assets, Net 5,505us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember		 6,343us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 10 years  
Maximum [Member] | Core Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 9 years 9 years
Maximum [Member] | Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 10 years 10 years
Maximum [Member] | Existing Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 7 years 7 years
Maximum [Member] | In-Process Research And Development [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 5 years [1] 5 years [1]
Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 1 year  
Minimum [Member] | Core Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 5 years 5 years
Minimum [Member] | Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 2 years 2 years
Minimum [Member] | Existing Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 3 years 3 years
Minimum [Member] | Trademarks [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 6 years 6 years
Minimum [Member] | Developed Technology Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 3 years 3 years
Minimum [Member] | In-Process Research And Development [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated average life 4 years 4 years [1]
[1] Table above reflects original classification upon acquisition. The majority of this in-process research and development was subsequently completed during 2013 and accordingly is being amortized.