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SEGMENTS - Separation-related Expenses (Details) $ in Millions	12 Months Ended
	May 27, 2018 USD ($)
SEGMENTS
Pre-tax expense related to Separation	$ 8.7

X

- Definition

Amount of pre tax separation fees.

+ References

No definition available.

+ Details

Name:	lw_SeparationExpenseBeforeTax
Namespace Prefix:	lw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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