LEASES - Assets and Liabilities - Additional Information (Details) $ in Millions	Feb. 23, 2020 USD ($)
LEASES
Finance lease, right-of-use asset, accumulated amortization	$ 11.6

Finance Lease, Right-of-use Asset, Accumulated Amortization

No definition available.

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