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Industry Segment Operations (Percentage of New Sales) (Details)
6 Months Ended
Apr. 26, 2015
Samsung Electronics Co., Ltd. [Member]  
Entity-Wide Revenue, Major Customer [Line Items]  
Percentage of Net Sales 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amat_CustomerOneMember
Taiwan Semiconductor Manufacturing Company Limited [Member]  
Entity-Wide Revenue, Major Customer [Line Items]  
Percentage of Net Sales 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amat_CustomerTwoMember