RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 26, 2018	Aug. 27, 2017	Aug. 28, 2016
Discontinued operations, disposed of by sale | Private Brands
Restructuring Cost and Reserve [Line Items]
Charges that have resulted or will result in cash outflows from plan inception	$ 84.5		$ 84.5
Non-cash charges from plan inception	45.7		45.7
Pre-tax expenses from plan inception	130.2		$ 130.2
Discontinued operations, spinoff | Lamb Weston
Restructuring Cost and Reserve [Line Items]
Charges that have resulted or will result in cash outflows from plan inception	2.1
SCAE Plan
Restructuring Cost and Reserve [Line Items]
Approved expenses (up to) in connection with the SCAE Plan	900.9
Charges incurred or expected to be incurred	469.8
Cash charges incurred or expected to be incurred	322.0
Non-cash charges incurred or expected to be incurred	147.8
Recognized charges	0.6	$ 11.4
Charges that have resulted or will result in cash outflows	0.1
Non-cash charges	0.5
Charges that have resulted or will result in cash outflows from plan inception	316.2
Non-cash charges from plan inception	$ 144.7