LEASES - ASC 842 - Total Leases - Maturities of Lease Liabilities (Details) $ in Millions	May 31, 2020 USD ($)
LEASES
2021	$ 35.9
2022	32.0
2023	23.8
2024	22.0
2025	19.6
Thereafter	83.9
Total lease payments	$ 217.2

Lessee, Liability, Payments, Due Next Twelve Months

No definition available.

Name:	lw_LesseeLiabilityPaymentsDueNextTwelveMonths
Namespace Prefix:	lw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant