Leases - Supplemental Balance Sheet (Details) $ in Thousands	Jun. 28, 2020 USD ($)
Leases [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Operating leases
Other assets	$ 174,583
Accrued expenses and other current liabilities	49,480
Other long-term liabilities	123,889
Total operating lease liabilities	173,369
Finance Leases
Property and Equipment, net	18,409
Current portion of long-term debt and lease liabilities	3,770
Long-term debt and lease liabilities	11,477
Total finance lease liabilities	$ 15,247
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	lrcx:PropertyPlantandEquipmentandFinanceLeaseRightofUseAssetafterAccumulatedDepreciationandAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:DebtCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations