DISCONTINUED OPERATIONS AND OTHER DIVESTITURES - Financial Data Included Within Discontinued Operations, Income Statement Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 11.6	$ 79.2	$ 103.0	$ (1,166.8)
Net income from discontinued operations attributable to CAG	8.4	75.5	96.2	(1,172.0)
Lamb Weston | Discontinued operations, spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	636.0	735.2	1,407.9	1,477.1
Income from discontinued operations before income taxes and equity method investment earnings	46.3	118.4	175.1	215.5
Income (loss) before income taxes and equity method investment earnings	46.3	118.4	175.1	215.5
Income tax expense	39.1	40.3	88.6	76.0
Equity method investment earnings	5.3	7.8	15.9	20.2
Income (loss) from discontinued operations, net of tax	12.5	85.9	102.4	159.7
Less: Net income attributable to noncontrolling interests	3.2	3.7	6.8	5.2
Net income from discontinued operations attributable to CAG	9.3	82.2	95.6	154.5
Private Brands | Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	(0.9)	958.9	(0.9)	1,850.7
Gain (loss) on sale of businesses	(0.5)	0.0	1.0	0.0
Goodwill and long-lived asset impairment charges	0.0	(86.3)	0.0	(1,898.6)
Income from discontinued operations before income taxes and equity method investment earnings	(0.6)	85.3	(1.3)	105.7
Income (loss) before income taxes and equity method investment earnings	(1.1)	(1.0)	(0.3)	(1,792.9)
Income tax expense	(0.2)	5.7	(0.9)	(466.4)
Income (loss) from discontinued operations, net of tax	$ (0.9)	$ (6.7)	$ 0.6	$ (1,326.5)