RESTRUCTURING ACTIVITIES - Narrative (Details)	3 Months Ended	12 Months Ended
	Nov. 29, 2015 USD ($) building lease	May 28, 2017 USD ($)	May 29, 2016 USD ($)	May 31, 2015 USD ($)
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)		880,500,000.0
Charges incurred or expected to be incurred		446,200,000
Cash charges		299,200,000
Non-cash charges		147,000,000
Restructuring and related cost, incurred cost		63,600,000	$ 281,800,000	$ 47,700,000
Charges that have resulted or will result in cash outflows		38,800,000
Non-cash charges anticipated to be recognized		24,800,000
Cash charges excluded from cumulative pre-tax expenses		285,500,000
Non-cash charges excluded from cumulative pre-tax expenses		136,800,000
Number of leases canceled | lease	2
Aggregate charges for early termination of leases		$ 43,200,000
Financing lease obligation	$ 74,200,000
SCAE Plan | Early termination of leases
Restructuring Cost and Reserve [Line Items]
Aggregate charges for early termination of leases	$ 55,600,000
SCAE Plan | Exchange of productive assets
Restructuring Cost and Reserve [Line Items]
Number of buildings acquired in exchange | building	2