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Stockholders' Equity, Comprehensive Income and Share-Based Compensation (ESPP Fair Value Assumptions) (Details) (Employee Stock Purchase Plan [Member], USD $)
3 Months Ended 6 Months Ended
Apr. 26, 2015
Apr. 27, 2014
Apr. 26, 2015
Apr. 27, 2014
Employee Stock Purchase Plan [Member]
       
Subsidiary, Sale of Stock [Line Items]        
Dividend yield 1.56%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
2.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
1.56%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
2.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
Expected volatility 31.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
25.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
31.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
25.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
Risk-free interest rate 0.07%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
0.08%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
0.07%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
0.08%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
Expected life (in years) 6 months 6 months 6 months 6 months
Weighted average estimated fair value (in dollars per share) $ 6.04amat_WeightedAverageEstimatedFairValueOfPurchaseRightsUnderEspp
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
$ 4.07amat_WeightedAverageEstimatedFairValueOfPurchaseRightsUnderEspp
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
$ 6.04amat_WeightedAverageEstimatedFairValueOfPurchaseRightsUnderEspp
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember
$ 4.07amat_WeightedAverageEstimatedFairValueOfPurchaseRightsUnderEspp
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember