Line of Credit Facility, Additional Borrowing Capacity, Expansion

No definition available.

Name:	lrcx_LineofCreditFacilityAdditionalBorrowingCapacityExpansion
Namespace Prefix:	lrcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Current Borrowing Capacity, Expansion

+ References

No definition available.

+ Details

Name:	lrcx_LineofCreditFacilityCurrentBorrowingCapacityExpansion
Namespace Prefix:	lrcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

Name:	us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=lrcx_FederalFundsRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=lrcx_OneMonthLiborMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LONG-TERM DEBT AND OTHER BORROWINGS - Revolving Credit Facility (Details) - Revolving credit facility - USD ($)	Feb. 25, 2019	Sep. 27, 2020
Extinguishment of Debt [Line Items]
Revolving unsecured credit facility	$ 1,250,000,000
Additional increase in the facility, available expansion	600,000,000.0
Revolving unsecured credit facility, available expansion	$ 1,850,000,000
Borrowings outstanding		$ 0
Federal Funds Rate
Extinguishment of Debt [Line Items]
Variable interest spread	0.50%
One-month LIBOR
Extinguishment of Debt [Line Items]
Variable interest spread	1.00%
One-month LIBOR \| Minimum
Extinguishment of Debt [Line Items]
Variable interest spread	0.00%
One-month LIBOR \| Maximum
Extinguishment of Debt [Line Items]
Variable interest spread	0.50%
LIBOR \| Minimum
Extinguishment of Debt [Line Items]
Variable interest spread	0.90%
LIBOR \| Maximum
Extinguishment of Debt [Line Items]
Variable interest spread	1.50%