STOCKHOLDERS' EQUITY - AOCI - Settlement Gains on Pension and Post-retirement Benefits (Details) $ in Millions	3 Months Ended
Aug. 27, 2017 USD ($)
STOCKHOLDERS' EQUITY
Net amount of settlement gains on pension and post-retirement benefits included in accumulated OCI to be amortized over the next 12 months, before tax	$ 0.2
Net amount of settlement gains on pension and post-retirement benefits included in accumulated OCI to be amortized over the next 12 months, after tax	$ 0.1

Amount, after tax, included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

No definition available.

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