BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015
Net sales
Total net sales	$ 2,088.4	$ 2,358.8	$ 3,984.0	$ 4,411.8
Operating profit
Equity method investment earnings	17.2	17.6	30.3	42.1
Interest expense, net	54.1	79.2	112.3	159.3
Income tax expense	78.4	43.1	247.6	92.4
Income from continuing operations	114.3	80.1	212.9	173.7
Less: Net income attributable to noncontrolling interests	0.6	0.7	0.8	0.9
Income from continuing operations attributable to Conagra Brands, Inc.	113.7	79.4	212.1	172.8
Reporting segments
Net sales
Total net sales	2,088.4	2,358.8	3,984.0	4,411.8
Operating profit
Total operating profit	342.9	363.0	691.4	638.4
General corporate expense
Operating profit
General corporate expense	113.3	178.2	148.9	255.1
Grocery & Snacks | Reporting segments
Net sales
Total net sales	853.9	906.1	1,611.1	1,706.6
Operating profit
Total operating profit	220.3	185.7	400.8	325.2
Refrigerated & Frozen | Reporting segments
Net sales
Total net sales	740.0	826.8	1,344.6	1,484.4
Operating profit
Total operating profit	117.9	123.8	210.1	204.9
International | Reporting segments
Net sales
Total net sales	211.4	221.3	406.1	427.7
Operating profit
Total operating profit	(26.7)	20.1	(175.9)	36.6
Foodservice | Reporting segments
Net sales
Total net sales	283.1	285.0	551.1	555.6
Operating profit
Total operating profit	31.9	20.4	53.6	46.6
Commercial | Reporting segments
Net sales
Total net sales	0.0	119.6	71.1	237.5
Operating profit
Total operating profit	$ (0.5)	$ 13.0	$ 202.8	$ 25.1