RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 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		$ 2.1
SCAE Plan
Restructuring Cost and Reserve [Line Items]
Approved expenses (up to) in connection with the SCAE Plan	880.5		880.5
Charges incurred or expected to incur	442.6		442.6
Cash charges incurred or expect to incur	299.9		299.9
Non-cash charges incurred or expect to incur	142.7		142.7
Recognized charges	13.7	$ 109.1	47.6	$ 259.5
Charges that have resulted or will result in cash outflows	10.3		31.2
Non-cash charges	3.4		16.4
Charges that have resulted or will result in cash outflows from plan inception	277.9		277.9
Non-cash charges from plan inception	$ 128.4		$ 128.4