INVESTMENTS IN JOINT VENTURES - Equity Method Investments - Summarized Financial Information - General Information (Details)	12 Months Ended
May 31, 2020	May 26, 2019	May 27, 2018
Summarized combined financial information for equity method investments
Summarized financial information of equity method investments, percentage of operations presented (as a percent)	100.00%	100.00%	100.00%

Equity Method Investment, Summarized Financial Information, Operations Presented, Percentage

No definition available.

Name:	lw_EquityMethodInvestmentSummarizedFinancialInformationOperationsPresentedPercentage
Namespace Prefix:	lw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration