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INVESTMENT IN JOINT VENTURES - Other Investments and Transactions with Ventures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015	May 29, 2016
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 150.8		$ 150.8		$ 155.2
Dividends received from equity method investments			13.9	$ 7.8
Lamb Weston RDO and Lamb Weston Meijer
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	150.8		150.8		$ 155.2
Sales	7.2	$ 3.6	3.4	3.0
Purchases	14.7	6.7	$ 7.3	$ 5.5
Dividends received from equity method investments	$ 5.6	$ 4.7
Lamb Weston/Meijer
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%		50.00%