INCOME TAXES - Step-up in Tax Basis (Details) $ in Millions	1 Months Ended
Nov. 30, 2016 USD ($)
INCOME TAXES
Net decrease in deferred tax liabilities	$ 75.0
Increase in deferred tax assets	155.0
Increase in valuation allowance	$ 80.0

The increase (decrease) in deferred tax assets valuation allowance resulting from a step-up in the tax basis in certain assets.

No definition available.

Name:	lw_DeferredTaxAssetsValuationAllowanceStepUpInTaxBasisInCertainAssetsIncreaseDecrease
Namespace Prefix:	lw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration