RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the Restructuring Plan (Details) - USD ($) $ in Millions	3 Months Ended	7 Months Ended	9 Months Ended
	Aug. 25, 2019	Aug. 25, 2019	Aug. 25, 2019	Dec. 31, 2018
Pinnacle Integration Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	$ 260.9	$ 260.9	$ 260.9	$ 360.0
Recognized pre-tax expenses	27.7		195.9
Pinnacle Integration Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	251.5	251.5	251.5
Recognized pre-tax expenses	26.9		189.0
Pinnacle Integration Restructuring Plan | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.6	0.6	0.6
Recognized pre-tax expenses	0.1		0.1
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	5.8	5.8	5.8
Recognized pre-tax expenses	0.1		3.8
Pinnacle Integration Restructuring Plan | Other cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	6.4	6.4	6.4
Recognized pre-tax expenses	0.2		3.9
Pinnacle Integration Restructuring Plan | Total cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Severance and related costs
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	118.1	118.1	118.1
Recognized pre-tax expenses	3.9		116.0
Pinnacle Integration Restructuring Plan | Severance and related costs | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	116.6	116.6	116.6
Recognized pre-tax expenses	3.7		114.5
Pinnacle Integration Restructuring Plan | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	8.2	8.2	8.2
Recognized pre-tax expenses	1.8		6.5
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	8.2	8.2	8.2
Recognized pre-tax expenses	1.8		6.5
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	3.8	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	3.6	3.6	3.6
Recognized pre-tax expenses	3.6		3.6
Pinnacle Integration Restructuring Plan | Contract/lease termination
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	17.0	17.0	17.0
Recognized pre-tax expenses	7.6		8.7
Pinnacle Integration Restructuring Plan | Contract/lease termination | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	16.3	16.3	16.3
Recognized pre-tax expenses	7.7		8.0
Pinnacle Integration Restructuring Plan | Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	93.3	93.3	93.3
Recognized pre-tax expenses	7.7		46.0
Pinnacle Integration Restructuring Plan | Consulting/professional fees | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	92.8	92.8	92.8
Recognized pre-tax expenses	7.4		45.5
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	14.1	14.1	14.1
Recognized pre-tax expenses	2.7		11.0
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	14.0	14.0	14.0
Recognized pre-tax expenses	2.7		10.9
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	254.5	254.5	254.5
Recognized pre-tax expenses	27.5		192.0
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	251.5	251.5	251.5
Recognized pre-tax expenses	26.9		189.0
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.8	1.8	1.8
Recognized pre-tax expenses	0.3		1.8
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Other cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.6	1.6	1.6
Recognized pre-tax expenses	0.1		1.6
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Total cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.6	1.6	1.6
Recognized pre-tax expenses	0.1		1.6
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Severance and related costs | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Asset impairment (net of gains on disposal) | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.2	0.2	0.2
Recognized pre-tax expenses	0.2		0.2
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Contract/lease termination | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Consulting/professional fees | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Other selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Grocery & Snacks | Selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.2	0.2	0.2
Recognized pre-tax expenses	0.2		0.2
Pinnacle Integration Restructuring Plan | International | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	3.5	3.5	3.5
Recognized pre-tax expenses	0.4		3.5
Pinnacle Integration Restructuring Plan | International | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | International | Other cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.7	0.7	0.7
Recognized pre-tax expenses	0.0		0.7
Pinnacle Integration Restructuring Plan | International | Total cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.7	0.7	0.7
Recognized pre-tax expenses	0.0		0.7
Pinnacle Integration Restructuring Plan | International | Severance and related costs | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.5	1.5	1.5
Recognized pre-tax expenses	0.2		1.5
Pinnacle Integration Restructuring Plan | International | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | International | Asset impairment (net of gains on disposal) | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | International | Contract/lease termination | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.7	0.7	0.7
Recognized pre-tax expenses	(0.1)		0.7
Pinnacle Integration Restructuring Plan | International | Consulting/professional fees | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.5	0.5	0.5
Recognized pre-tax expenses	0.3		0.5
Pinnacle Integration Restructuring Plan | International | Other selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.1	0.1	0.1
Recognized pre-tax expenses	0.0		0.1
Pinnacle Integration Restructuring Plan | International | Selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	2.8	2.8	2.8
Recognized pre-tax expenses	0.4		2.8
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	4.1	4.1	4.1
Recognized pre-tax expenses	0.1		1.6
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.6	0.6	0.6
Recognized pre-tax expenses	0.1		0.1
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Other cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	3.5	3.5	3.5
Recognized pre-tax expenses	0.0		1.5
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Total cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	4.1	4.1	4.1
Recognized pre-tax expenses	0.1		1.6
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Severance and related costs | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Asset impairment (net of gains on disposal) | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Contract/lease termination | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Consulting/professional fees | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Other selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0		0.0
Conagra Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	98.4	98.4	98.4
Recognized pre-tax expenses	21.1	23.3
Conagra Restructuring Plan | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	9.1	9.1	9.1
Conagra Restructuring Plan | Other cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Conagra Restructuring Plan | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	58.3	58.3	58.3
Recognized pre-tax expenses	4.3	5.1
Conagra Restructuring Plan | Total cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Severance and related costs
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	13.7	13.7	13.7
Recognized pre-tax expenses	4.0	5.4
Conagra Restructuring Plan | Severance and related costs | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.2	0.2	0.2
Recognized pre-tax expenses	0.0	0.2
Conagra Restructuring Plan | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	49.2	49.2	49.2
Recognized pre-tax expenses	4.3	5.1
Conagra Restructuring Plan | Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	11.9	11.9	11.9
Recognized pre-tax expenses	11.9	11.9
Conagra Restructuring Plan | Asset impairment (net of gains on disposal) | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Contract/lease termination
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.3	0.3	0.3
Recognized pre-tax expenses	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	0.1
Recognized pre-tax expenses	0.1	0.1
Conagra Restructuring Plan | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	13.6	13.6	13.6
Recognized pre-tax expenses	0.2	0.2
Conagra Restructuring Plan | Other selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	39.5	39.5	39.5
Recognized pre-tax expenses	16.2	17.6
Conagra Restructuring Plan | Selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.3	0.3	0.3
Recognized pre-tax expenses	0.1	0.3
Conagra Restructuring Plan | Total
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	97.8	97.8	97.8
Recognized pre-tax expenses	20.5	22.7
Conagra Restructuring Plan | Total | Corporate
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.3	0.3	0.3
Recognized pre-tax expenses	0.1	0.3
Conagra Restructuring Plan | Pension And Postretirement Nonservice Cost Income
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.6	0.6	0.6
Recognized pre-tax expenses	0.6	0.6
Conagra Restructuring Plan | Grocery & Snacks | Other cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	9.0	9.0	9.0
Conagra Restructuring Plan | Grocery & Snacks | Total cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	56.5	56.5	56.5
Recognized pre-tax expenses	3.9	3.9
Conagra Restructuring Plan | Grocery & Snacks | Severance and related costs | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	11.1	11.1	11.1
Recognized pre-tax expenses	3.0	3.0
Conagra Restructuring Plan | Grocery & Snacks | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	47.5	47.5	47.5
Recognized pre-tax expenses	3.9	3.9
Conagra Restructuring Plan | Grocery & Snacks | Asset impairment (net of gains on disposal) | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	11.9	11.9	11.9
Recognized pre-tax expenses	11.9	11.9
Conagra Restructuring Plan | Grocery & Snacks | Contract/lease termination | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.2	0.2	0.2
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Grocery & Snacks | Other selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	12.3	12.3	12.3
Recognized pre-tax expenses	0.2	0.2
Conagra Restructuring Plan | Grocery & Snacks | Selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	35.5	35.5	35.5
Recognized pre-tax expenses	15.1	15.1
Conagra Restructuring Plan | Grocery & Snacks | Total | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	92.0	92.0	92.0
Recognized pre-tax expenses	19.0	19.0
Conagra Restructuring Plan | International | Other cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Conagra Restructuring Plan | International | Total cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | International | Severance and related costs | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.8	1.8	1.8
Recognized pre-tax expenses	0.9	1.6
Conagra Restructuring Plan | International | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | International | Asset impairment (net of gains on disposal) | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | International | Contract/lease termination | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | International | Other selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | International | Selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.8	1.8	1.8
Recognized pre-tax expenses	0.9	1.6
Conagra Restructuring Plan | International | Total | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.8	1.8	1.8
Recognized pre-tax expenses	0.9	1.6
Conagra Restructuring Plan | Refrigerated & Frozen | Other cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.1	0.1	0.1
Conagra Restructuring Plan | Refrigerated & Frozen | Total cost of goods sold | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.8	1.8	1.8
Recognized pre-tax expenses	0.4	1.2
Conagra Restructuring Plan | Refrigerated & Frozen | Severance and related costs | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.6	0.6	0.6
Recognized pre-tax expenses	0.1	0.6
Conagra Restructuring Plan | Refrigerated & Frozen | Accelerated depreciation | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.7	1.7	1.7
Recognized pre-tax expenses	0.4	1.2
Conagra Restructuring Plan | Refrigerated & Frozen | Asset impairment (net of gains on disposal) | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Refrigerated & Frozen | Contract/lease termination | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	0.0	0.0	0.0
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Refrigerated & Frozen | Other selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.3	1.3	1.3
Recognized pre-tax expenses	0.0	0.0
Conagra Restructuring Plan | Refrigerated & Frozen | Selling, general and administrative expenses | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	1.9	1.9	1.9
Recognized pre-tax expenses	0.1	0.6
Conagra Restructuring Plan | Refrigerated & Frozen | Total | Reporting segments
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	3.7	3.7	$ 3.7
Recognized pre-tax expenses	$ 0.5	$ 1.8