RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($)	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Private Brands
Restructuring Cost and Reserve [Line Items]
Cash charges excluded from cumulative pre-tax expenses	$ 84,500,000
Non-cash charges excluded from cumulative pre-tax expenses	45,700,000
Charges excluded from cumulative pre-tax expenses	130,200,000
Spinoff | Lamb Weston
Restructuring Cost and Reserve [Line Items]
Cash charges excluded from cumulative pre-tax expenses	2,100,000
SCAE Plan
Restructuring Cost and Reserve [Line Items]
Approved expenses (up to)	900,900,000.0
Charges incurred or expected to be incurred	471,600,000
Cash charges	322,100,000
Non-cash charges	149,500,000
Restructuring and related cost, incurred cost	38,000,000	$ 63,600,000	$ 281,800,000
Charges that have resulted or will result in cash outflows	30,600,000
Non-cash charges anticipated to be recognized	7,400,000
Cash charges excluded from cumulative pre-tax expenses	316,100,000
Non-cash charges excluded from cumulative pre-tax expenses	$ 144,200,000