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Schedule of Recognized Interest Cost Relating to Both Contractual Interest Coupon and Amortization of Discount on Liability Component of Notes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 28, 2014
Dec. 29, 2013
Debt Instrument [Line Items]        
Amortization of interest discount     $ 17,118us-gaap_AmortizationOfDebtDiscountPremium $ 16,339us-gaap_AmortizationOfDebtDiscountPremium
2016, 2018 and 2041 Senior Notes        
Debt Instrument [Line Items]        
Contractual interest coupon 6,562lrcx_ContractualInterestCoupon
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 6,562lrcx_ContractualInterestCoupon
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 13,124lrcx_ContractualInterestCoupon
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 13,124lrcx_ContractualInterestCoupon
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember
Amortization of interest discount 8,610us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 8,217us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 17,119us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 16,339us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember
Amortization of issuance costs 590us-gaap_AmortizationOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 591us-gaap_AmortizationOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 1,181us-gaap_AmortizationOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 1,181us-gaap_AmortizationOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember
Total interest cost recognized $ 15,762us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 $ 15,370us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 $ 31,424us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember		 $ 30,644us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= lrcx_TwoThousandSixteenTwoThousandEighteenAndTwoThousandFortyOneSeniorNotesMember