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LEGAL PROCEEDINGS Legal Proceedings (Details) (Settled Litigation [Member], Southern District of New York [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2014
Sep. 30, 2014
Settled Litigation [Member] | Southern District of New York [Member]
    
Loss Contingencies [Line Items]    
Litigation Settlement, Amount $ 5.1us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationCaseAxis
= affx_SouthernDistrictofNewYorkMember
/ us-gaap_LitigationStatusAxis
= affx_SettledLitigationMember		 $ 5.1us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationCaseAxis
= affx_SouthernDistrictofNewYorkMember
/ us-gaap_LitigationStatusAxis
= affx_SettledLitigationMember