RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the Restructuring Plan (Details) - USD ($) $ in Millions	12 Months Ended			30 Months Ended
	May 30, 2021	May 31, 2020	May 26, 2019	May 30, 2021
Pinnacle Integration Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	$ 358.0			$ 358.0
Recognized pre-tax expenses	31.7	$ 73.8	$ 168.2	273.7
Pinnacle Integration Restructuring Plan | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	56.2			56.2
Recognized pre-tax expenses	5.7			8.5
Pinnacle Integration Restructuring Plan | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	33.7			33.7
Recognized pre-tax expenses	4.2			16.0
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				4.1
Pinnacle Integration Restructuring Plan | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	264.0			264.0
Recognized pre-tax expenses	21.8			245.1
Pinnacle Integration Restructuring Plan | Accelerated depreciation
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	12.8			12.8
Recognized pre-tax expenses	2.5			5.2
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	7.6			7.6
Recognized pre-tax expenses				0.6
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	5.2			5.2
Recognized pre-tax expenses	2.5			4.6
Pinnacle Integration Restructuring Plan | Other cost of goods sold
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	11.9			11.9
Recognized pre-tax expenses	1.9			5.9
Pinnacle Integration Restructuring Plan | Other cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	3.8			3.8
Recognized pre-tax expenses	0.5			2.3
Pinnacle Integration Restructuring Plan | Other cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	7.4			7.4
Recognized pre-tax expenses	1.4			2.9
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	24.7			24.7
Recognized pre-tax expenses	4.4			11.1
Pinnacle Integration Restructuring Plan | Total cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	11.4			11.4
Recognized pre-tax expenses	0.5			2.9
Pinnacle Integration Restructuring Plan | Total cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	12.6			12.6
Recognized pre-tax expenses	3.9			7.5
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	118.2			118.2
Recognized pre-tax expenses	(3.6)			117.3
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	(0.9)			3.4
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				1.5
Pinnacle Integration Restructuring Plan | Severance and related costs | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	112.4			112.4
Recognized pre-tax expenses	(2.7)			112.4
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal)
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	36.9			36.9
Recognized pre-tax expenses				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	30.3			30.3
Recognized pre-tax expenses	0.1			0.3
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	4.0			4.0
Recognized pre-tax expenses	0.2			4.0
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal) | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	2.6			2.6
Recognized pre-tax expenses	(0.3)			2.6
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				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				7.4
Pinnacle Integration Restructuring Plan | Contract/lease termination
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	32.6			32.6
Recognized pre-tax expenses	2.6			18.5
Pinnacle Integration Restructuring Plan | Contract/lease termination | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	7.7			7.7
Recognized pre-tax expenses	1.8			1.8
Pinnacle Integration Restructuring Plan | Contract/lease termination | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	8.2			8.2
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	15.9			15.9
Recognized pre-tax expenses	0.8			15.9
Pinnacle Integration Restructuring Plan | Consulting/professional fees
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	106.5			106.5
Recognized pre-tax expenses	22.7			91.0
Pinnacle Integration Restructuring Plan | Consulting/professional fees | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.0			1.0
Recognized pre-tax expenses	0.5			0.7
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				0.8
Pinnacle Integration Restructuring Plan | Consulting/professional fees | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	104.7			104.7
Recognized pre-tax expenses	22.2			89.5
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	31.7			31.7
Recognized pre-tax expenses	5.6			21.5
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	5.8			5.8
Recognized pre-tax expenses	2.8			2.8
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	4.6			4.6
Recognized pre-tax expenses	1.0			1.1
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				0.3
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	21.0			21.0
Recognized pre-tax expenses	1.8			17.3
Pinnacle Integration Restructuring Plan | Total selling, general and administrative expenses
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	333.3			333.3
Recognized pre-tax expenses	27.3			262.6
Pinnacle Integration Restructuring Plan | Total selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	44.8			44.8
Recognized pre-tax expenses	5.2			5.6
Pinnacle Integration Restructuring Plan | Total selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	21.1			21.1
Recognized pre-tax expenses	0.3			8.5
Pinnacle Integration Restructuring Plan | Total 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				3.4
Pinnacle Integration Restructuring Plan | Total selling, general and administrative expenses | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	264.0			264.0
Recognized pre-tax expenses	21.8			245.1
Conagra Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	157.3			157.3
Recognized pre-tax expenses	46.2	$ 64.4	$ 2.2	112.8
Conagra Restructuring Plan | Accelerated depreciation
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	84.4			84.4
Recognized pre-tax expenses	30.4			58.7
Conagra Restructuring Plan | Accelerated depreciation | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	34.7			34.7
Recognized pre-tax expenses	7.9			32.0
Conagra Restructuring Plan | Accelerated depreciation | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	49.7			49.7
Recognized pre-tax expenses	22.5			26.7
Conagra Restructuring Plan | Other cost of goods sold
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	11.0			11.0
Recognized pre-tax expenses	2.3			5.0
Conagra Restructuring Plan | Other cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	8.9			8.9
Recognized pre-tax expenses	2.3			4.8
Conagra Restructuring Plan | Other cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	2.1			2.1
Recognized pre-tax expenses				0.2
Conagra Restructuring Plan | Total cost of goods sold
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	95.4			95.4
Recognized pre-tax expenses	32.7			63.7
Conagra Restructuring Plan | Total cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	43.6			43.6
Recognized pre-tax expenses	10.2			36.8
Conagra Restructuring Plan | Total cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	51.8			51.8
Recognized pre-tax expenses	22.5			26.9
Conagra Restructuring Plan | Severance and related costs
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	17.4			17.4
Recognized pre-tax expenses	7.0			15.4
Conagra Restructuring Plan | Severance and related costs | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	12.0			12.0
Recognized pre-tax expenses	5.7			10.4
Conagra Restructuring Plan | Severance and related costs | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	2.2			2.2
Recognized pre-tax expenses				1.8
Conagra Restructuring Plan | Severance and related costs | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.1			1.1
Recognized pre-tax expenses	(0.1)			1.1
Conagra Restructuring Plan | Severance and related costs | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	2.1			2.1
Recognized pre-tax expenses	1.4			2.1
Conagra Restructuring Plan | Asset impairment (net of gains on disposal)
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	27.5			27.5
Recognized pre-tax expenses	2.2			27.5
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	27.1			27.1
Recognized pre-tax expenses	2.1			27.1
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	0.3			0.3
Recognized pre-tax expenses	0.1			0.3
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
Conagra Restructuring Plan | Contract/lease termination
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.2			0.2
Conagra Restructuring Plan | Contract/lease termination | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.1			0.1
Conagra Restructuring Plan | Contract/lease termination | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.1			0.1
Conagra Restructuring Plan | Consulting/professional fees
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.7			0.7
Recognized pre-tax expenses				0.1
Conagra Restructuring Plan | Consulting/professional fees | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	0.7			0.7
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	15.5			15.5
Recognized pre-tax expenses	4.3			5.5
Conagra Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	10.7			10.7
Recognized pre-tax expenses	4.1			5.0
Conagra Restructuring Plan | Other selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	4.6			4.6
Recognized pre-tax expenses				0.3
Conagra Restructuring Plan | Other selling, general and administrative expenses | Corporate
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 | Total selling, general and administrative expenses
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	61.3			61.3
Recognized pre-tax expenses	13.5			48.5
Conagra Restructuring Plan | Total selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	49.9			49.9
Recognized pre-tax expenses	11.9			42.5
Conagra Restructuring Plan | Total selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	7.1			7.1
Recognized pre-tax expenses	0.1			2.4
Conagra Restructuring Plan | Total selling, general and administrative expenses | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.2			1.2
Recognized pre-tax expenses	(0.1)			1.2
Conagra Restructuring Plan | Total selling, general and administrative expenses | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	3.1			3.1
Recognized pre-tax expenses	1.6			2.4
Conagra Restructuring Plan | Total
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	156.7			156.7
Recognized pre-tax expenses	46.2			112.2
Conagra Restructuring Plan | Total | Reporting segments | Grocery & Snacks
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	93.5			93.5
Recognized pre-tax expenses	22.1			79.3
Conagra Restructuring Plan | Total | Reporting segments | Refrigerated & Frozen
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	58.9			58.9
Recognized pre-tax expenses	22.6			29.3
Conagra Restructuring Plan | Total | Reporting segments | International
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	1.2			1.2
Recognized pre-tax expenses	(0.1)			1.2
Conagra Restructuring Plan | Total | Corporate
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	3.1			3.1
Recognized pre-tax expenses	1.6			2.4
Conagra Restructuring Plan | 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