RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the Restructuring Plan (Details) - USD ($) $ in Millions	12 Months Ended		18 Months Ended
	May 31, 2020	May 26, 2019	May 31, 2020
Pinnacle Integration Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	$ 360.2		$ 360.2
Recognized pre-tax expenses	73.8	$ 168.2	242.0
Pinnacle Integration Restructuring Plan | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	65.6		65.6
Recognized pre-tax expenses	1.3		2.8
Pinnacle Integration Restructuring Plan | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	28.7		28.7
Recognized pre-tax expenses	10.3		11.8
Pinnacle Integration Restructuring Plan | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	4.1		4.1
Recognized pre-tax expenses	1.0		4.1
Pinnacle Integration Restructuring Plan | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	261.8		261.8
Recognized pre-tax expenses	61.2		223.3
Pinnacle Integration Restructuring Plan | Accelerated depreciation
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	15.5		15.5
Recognized pre-tax expenses	2.7		2.7
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	9.9		9.9
Recognized pre-tax expenses	0.6		0.6
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	5.6		5.6
Recognized pre-tax expenses	2.1		2.1
Pinnacle Integration Restructuring Plan | Other cost of goods sold
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	17.6		17.6
Recognized pre-tax expenses	0.3		4.0
Pinnacle Integration Restructuring Plan | Other cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	7.7		7.7
Recognized pre-tax expenses	0.3		1.8
Pinnacle Integration Restructuring Plan | Other cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	9.2		9.2
Recognized pre-tax expenses			1.5
Pinnacle Integration Restructuring Plan | Other cost of goods sold | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.7		0.7
Recognized pre-tax expenses			0.7
Pinnacle Integration Restructuring Plan | Total cost of goods sold
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	33.1		33.1
Recognized pre-tax expenses	3.0		6.7
Pinnacle Integration Restructuring Plan | Total cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	17.6		17.6
Recognized pre-tax expenses	0.9		2.4
Pinnacle Integration Restructuring Plan | Total cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	14.8		14.8
Recognized pre-tax expenses	2.1		3.6
Pinnacle Integration Restructuring Plan | Total cost of goods sold | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.7		0.7
Recognized pre-tax expenses			0.7
Pinnacle Integration Restructuring Plan | Severance and related costs
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	120.9		120.9
Recognized pre-tax expenses	8.8		120.9
Pinnacle Integration Restructuring Plan | Severance and related costs | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	4.3		4.3
Recognized pre-tax expenses	4.3		4.3
Pinnacle Integration Restructuring Plan | Severance and related costs | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.5		1.5
Recognized pre-tax expenses	0.2		1.5
Pinnacle Integration Restructuring Plan | Severance and related costs | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	115.1		115.1
Recognized pre-tax expenses	4.3		115.1
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal)
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	42.9		42.9
Recognized pre-tax expenses	6.9		6.9
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal) | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	36.2		36.2
Recognized pre-tax expenses	0.2		0.2
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal) | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	3.8		3.8
Recognized pre-tax expenses	3.8		3.8
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal) | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	2.9		2.9
Recognized pre-tax expenses	2.9		2.9
Pinnacle Integration Restructuring Plan | Accelerated depreciation
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	7.4		7.4
Recognized pre-tax expenses	2.7		7.4
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	7.4		7.4
Recognized pre-tax expenses	2.7		7.4
Pinnacle Integration Restructuring Plan | Contract/lease termination
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	24.6		24.6
Recognized pre-tax expenses	14.8		15.9
Pinnacle Integration Restructuring Plan | Contract/lease termination | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.4		1.4
Pinnacle Integration Restructuring Plan | Contract/lease termination | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	4.7		4.7
Pinnacle Integration Restructuring Plan | Contract/lease termination | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.8		0.8
Recognized pre-tax expenses			0.8
Pinnacle Integration Restructuring Plan | Contract/lease termination | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	17.7		17.7
Recognized pre-tax expenses	14.8		15.1
Pinnacle Integration Restructuring Plan | Consulting/professional fees
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	91.3		91.3
Recognized pre-tax expenses	30.0		68.3
Pinnacle Integration Restructuring Plan | Consulting/professional fees | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.2		0.2
Recognized pre-tax expenses	0.2		0.2
Pinnacle Integration Restructuring Plan | Consulting/professional fees | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.8		0.8
Recognized pre-tax expenses	0.6		0.8
Pinnacle Integration Restructuring Plan | Consulting/professional fees | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	90.3		90.3
Recognized pre-tax expenses	29.2		67.3
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	40.0		40.0
Recognized pre-tax expenses	7.6		15.9
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	10.2		10.2
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.1		1.1
Recognized pre-tax expenses	0.1		0.1
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.3		0.3
Recognized pre-tax expenses	0.2		0.3
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	28.4		28.4
Recognized pre-tax expenses	7.3		15.5
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	327.1		327.1
Recognized pre-tax expenses	70.8		235.3
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	48.0		48.0
Recognized pre-tax expenses	0.4		0.4
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	13.9		13.9
Recognized pre-tax expenses	8.2		8.2
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	3.4		3.4
Recognized pre-tax expenses	1.0		3.4
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	261.8		261.8
Recognized pre-tax expenses	61.2		223.3
Conagra Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	129.5		129.5
Recognized pre-tax expenses	64.4	$ 2.2	66.6
Conagra Restructuring Plan | Accelerated depreciation
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	58.1		58.1
Recognized pre-tax expenses	27.5		28.3
Conagra Restructuring Plan | Accelerated depreciation | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	38.0		38.0
Recognized pre-tax expenses	24.1		24.1
Conagra Restructuring Plan | Accelerated depreciation | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	20.1		20.1
Recognized pre-tax expenses	3.4		4.2
Conagra Restructuring Plan | Other cost of goods sold
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	10.0		10.0
Recognized pre-tax expenses	2.7		2.7
Conagra Restructuring Plan | Other cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	9.0		9.0
Recognized pre-tax expenses	2.5		2.5
Conagra Restructuring Plan | Other cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.0		1.0
Recognized pre-tax expenses	0.2		0.2
Conagra Restructuring Plan | Total cost of goods sold
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	68.1		68.1
Recognized pre-tax expenses	30.2		31.0
Conagra Restructuring Plan | Total cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	47.0		47.0
Recognized pre-tax expenses	26.6		26.6
Conagra Restructuring Plan | Total cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	21.1		21.1
Recognized pre-tax expenses	3.6		4.4
Conagra Restructuring Plan | Severance and related costs
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	17.5		17.5
Recognized pre-tax expenses	7.0		8.4
Conagra Restructuring Plan | Severance and related costs | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	12.1		12.1
Recognized pre-tax expenses	4.7		4.7
Conagra Restructuring Plan | Severance and related costs | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	3.5		3.5
Recognized pre-tax expenses	1.3		1.8
Conagra Restructuring Plan | Severance and related costs | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.2		1.2
Recognized pre-tax expenses	0.5		1.2
Conagra Restructuring Plan | Severance and related costs | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.7		0.7
Recognized pre-tax expenses	0.5		0.7
Conagra Restructuring Plan | Asset impairment (net of gains on disposal)
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	25.3		25.3
Recognized pre-tax expenses	25.3		25.3
Conagra Restructuring Plan | Asset impairment (net of gains on disposal) | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	25.0		25.0
Recognized pre-tax expenses	25.0		25.0
Conagra Restructuring Plan | Asset impairment (net of gains on disposal) | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.2		0.2
Recognized pre-tax expenses	0.2		0.2
Conagra Restructuring Plan | Asset impairment (net of gains on disposal) | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.1		0.1
Recognized pre-tax expenses	0.1		0.1
Conagra Restructuring Plan | Contract/lease termination
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.3		0.3
Recognized pre-tax expenses	0.1
Conagra Restructuring Plan | Contract/lease termination | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.2		0.2
Conagra Restructuring Plan | Contract/lease termination | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.1		0.1
Recognized pre-tax expenses	0.1
Conagra Restructuring Plan | Consulting/professional fees
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.2		1.2
Recognized pre-tax expenses			0.1
Conagra Restructuring Plan | Consulting/professional fees | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.2		1.2
Recognized pre-tax expenses			0.1
Conagra Restructuring Plan | Other selling, general and administrative expenses
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	16.5		16.5
Recognized pre-tax expenses	1.2		1.2
Conagra Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	14.3		14.3
Recognized pre-tax expenses	0.9		0.9
Conagra Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.9		1.9
Recognized pre-tax expenses	0.3		0.3
Conagra Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.3		0.3
Conagra Restructuring Plan | Selling, general and administrative expenses
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	60.8		60.8
Recognized pre-tax expenses	33.6		35.0
Conagra Restructuring Plan | Selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	51.6		51.6
Recognized pre-tax expenses	30.6		30.6
Conagra Restructuring Plan | Selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	5.6		5.6
Recognized pre-tax expenses	1.8		2.3
Conagra Restructuring Plan | Selling, general and administrative expenses | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.6		1.6
Recognized pre-tax expenses	0.6		1.3
Conagra Restructuring Plan | Selling, general and administrative expenses | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	2.0		2.0
Recognized pre-tax expenses	0.6		0.8
Conagra Restructuring Plan | Total
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	128.9		128.9
Recognized pre-tax expenses	63.8		66.0
Conagra Restructuring Plan | Total | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	98.6		98.6
Recognized pre-tax expenses	57.2		57.2
Conagra Restructuring Plan | Total | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	26.7		26.7
Recognized pre-tax expenses	5.4		6.7
Conagra Restructuring Plan | Total | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.6		1.6
Recognized pre-tax expenses	0.6		1.3
Conagra Restructuring Plan | Total | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	2.0		2.0
Recognized pre-tax expenses	0.6		0.8
Conagra Restructuring Plan | Reclassified to Pension and postretirement non-service income
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.6		0.6
Recognized pre-tax expenses	$ 0.6		$ 0.6