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RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the Restructuring Plan (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Nov. 24, 2019
Nov. 25, 2018
Nov. 24, 2019
Nov. 25, 2018
Nov. 24, 2019
Nov. 24, 2019
Dec. 31, 2018
Pinnacle Integration Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred $ 267.4   $ 267.4   $ 267.4 $ 267.4 $ 360.0
Recognized pre-tax expenses 16.2 $ 102.6 43.9 $ 102.6   212.1  
Pinnacle Integration Restructuring Plan | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 259.4   259.4   259.4 259.4  
Recognized pre-tax expenses 15.4   42.3     204.4  
Pinnacle Integration Restructuring Plan | Accelerated depreciation              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 0.8   0.8   0.8 0.8  
Recognized pre-tax expenses 0.4   0.5     0.5  
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 0.0   0.0   0.0 0.0  
Recognized pre-tax expenses 0.0   0.0     0.0  
Pinnacle Integration Restructuring Plan | Other cost of goods sold              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 3.8   3.8   3.8 3.8  
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 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 4.6   4.6   4.6 4.6  
Recognized pre-tax expenses 0.4   0.6     4.3  
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 0.0  
Recognized pre-tax expenses 0.0   0.0     0.0  
Pinnacle Integration Restructuring Plan | Severance and related costs              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 116.7   116.7   116.7 116.7  
Recognized pre-tax expenses 0.7   4.6     116.7  
Pinnacle Integration Restructuring Plan | Severance and related costs | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 115.2   115.2   115.2 115.2  
Recognized pre-tax expenses 0.7   4.4     115.2  
Pinnacle Integration Restructuring Plan | Accelerated depreciation              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 8.1   8.1   8.1 8.1  
Recognized pre-tax expenses 0.6   2.4     7.1  
Pinnacle Integration Restructuring Plan | Accelerated depreciation | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 8.1   8.1   8.1 8.1  
Recognized pre-tax expenses 0.6   2.4     7.1  
Pinnacle Integration Restructuring Plan | Asset impairment (net of gains on disposal)              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 3.1   3.1   3.1 3.1  
Recognized pre-tax expenses (0.7)   3.1     3.1  
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   2.9 2.9  
Recognized pre-tax expenses (0.7)   2.9     2.9  
Pinnacle Integration Restructuring Plan | Contract/lease termination              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 14.9   14.9   14.9 14.9  
Recognized pre-tax expenses 4.2   11.8     12.9  
Pinnacle Integration Restructuring Plan | Contract/lease termination | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 14.1   14.1   14.1 14.1  
Recognized pre-tax expenses 4.1   11.8     12.1  
Pinnacle Integration Restructuring Plan | Consulting/professional fees              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 86.5   86.5   86.5 86.5  
Recognized pre-tax expenses 8.2   15.9     54.2  
Pinnacle Integration Restructuring Plan | Consulting/professional fees | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 85.7   85.7   85.7 85.7  
Recognized pre-tax expenses 7.9   15.3     53.4  
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 33.5   33.5   33.5 33.5  
Recognized pre-tax expenses 2.8   5.5     13.8  
Pinnacle Integration Restructuring Plan | Other selling, general and administrative expenses | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 33.4   33.4   33.4 33.4  
Recognized pre-tax expenses 2.8   5.5     13.7  
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 262.8   262.8   262.8 262.8  
Recognized pre-tax expenses 15.8   43.3     207.8  
Pinnacle Integration Restructuring Plan | Selling, general and administrative expenses | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 259.4   259.4   259.4 259.4  
Recognized pre-tax expenses 15.4   42.3     204.4  
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 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 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 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 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 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 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 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 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 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 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 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 3.9   3.9   3.9 3.9  
Recognized pre-tax expenses 0.4   0.8     3.9  
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 0.0  
Recognized pre-tax expenses 0.0   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 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 0.7  
Recognized pre-tax expenses 0.0   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 1.5  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   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 0.8   0.8   0.8 0.8  
Recognized pre-tax expenses 0.1   0.0     0.8  
Pinnacle Integration Restructuring Plan | International | Consulting/professional fees | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 0.8   0.8   0.8 0.8  
Recognized pre-tax expenses 0.3   0.6     0.8  
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 0.1  
Recognized pre-tax expenses 0.0   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 3.2   3.2   3.2 3.2  
Recognized pre-tax expenses 0.4   0.8     3.2  
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 2.3   2.3   2.3 2.3  
Recognized pre-tax expenses 0.4   0.5     2.0  
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Accelerated depreciation | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 0.8   0.8   0.8 0.8  
Recognized pre-tax expenses 0.4   0.5     0.5  
Pinnacle Integration Restructuring Plan | Refrigerated & Frozen | Other cost of goods sold | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 1.5   1.5   1.5 1.5  
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 2.3   2.3   2.3 2.3  
Recognized pre-tax expenses 0.4   0.5     2.0  
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 0.0  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   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 0.0  
Recognized pre-tax expenses 0.0   0.0     0.0  
Conagra Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 104.8   104.8   104.8 104.8  
Recognized pre-tax expenses 19.6   40.7   42.9    
Conagra Restructuring Plan | Other cost of goods sold              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 9.2   9.2   9.2 9.2  
Recognized pre-tax expenses 0.2   0.2   0.2    
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 0.0  
Recognized pre-tax expenses     0.0   0.0    
Conagra Restructuring Plan | Total cost of goods sold              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 52.4   52.4   52.4 52.4  
Recognized pre-tax expenses 7.2   11.5   12.3    
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 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 13.2   13.2   13.2 13.2  
Recognized pre-tax expenses (0.4)   3.6   5.0    
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 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 43.2   43.2   43.2 43.2  
Recognized pre-tax expenses 7.0   11.3   12.1    
Conagra Restructuring Plan | Accelerated depreciation | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 0.0   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 24.6   24.6   24.6 24.6  
Recognized pre-tax expenses 12.7   24.6   24.6    
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 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 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 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 13.7   13.7   13.7 13.7  
Recognized pre-tax expenses 0.1   0.3   0.3    
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 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 51.8   51.8   51.8 51.8  
Recognized pre-tax expenses 12.4   28.6   30.0    
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 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 104.2   104.2   104.2 104.2  
Recognized pre-tax expenses 19.6   40.1   42.3    
Conagra Restructuring Plan | Total | Corporate              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 0.3   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 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 4.1   4.1   4.1 4.1  
Recognized pre-tax expenses 0.0   0.0   0.0    
Conagra Restructuring Plan | Grocery & Snacks | Total cost of goods sold | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 35.2   35.2   35.2 35.2  
Recognized pre-tax expenses 6.5   10.4   10.4    
Conagra Restructuring Plan | Grocery & Snacks | Severance and related costs | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 9.3   9.3   9.3 9.3  
Recognized pre-tax expenses 0.0   3.0   3.0    
Conagra Restructuring Plan | Grocery & Snacks | Accelerated depreciation | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 31.1   31.1   31.1 31.1  
Recognized pre-tax expenses 6.5   10.4   10.4    
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 24.5   24.5   24.5 24.5  
Recognized pre-tax expenses 12.6   24.5   24.5    
Conagra Restructuring Plan | Grocery & Snacks | Contract/lease termination | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 0.1   0.1   0.1 0.1  
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 12.1   12.1   12.1 12.1  
Recognized pre-tax expenses 0.0   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 46.0   46.0   46.0 46.0  
Recognized pre-tax expenses 12.6   27.7   27.7    
Conagra Restructuring Plan | Grocery & Snacks | Total | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 81.2   81.2   81.2 81.2  
Recognized pre-tax expenses 19.1   38.1   38.1    
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 0.0  
Recognized pre-tax expenses 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 0.0  
Recognized pre-tax expenses 0.0   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 1.2   1.2   1.2 1.2  
Recognized pre-tax expenses (0.4)   0.5   1.2    
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 0.0  
Recognized pre-tax expenses 0.0   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 0.1   0.1   0.1 0.1  
Recognized pre-tax expenses 0.1   0.1   0.1    
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 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 0.0  
Recognized pre-tax expenses 0.0   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 1.3   1.3   1.3 1.3  
Recognized pre-tax expenses (0.3)   0.6   1.3    
Conagra Restructuring Plan | International | Total | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 1.3   1.3   1.3 1.3  
Recognized pre-tax expenses (0.3)   0.6   1.3    
Conagra Restructuring Plan | Refrigerated & Frozen | Other cost of goods sold | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 5.1   5.1   5.1 5.1  
Recognized pre-tax expenses 0.2   0.2   0.2    
Conagra Restructuring Plan | Refrigerated & Frozen | Total cost of goods sold | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 17.2   17.2   17.2 17.2  
Recognized pre-tax expenses 0.7   1.1   1.9    
Conagra Restructuring Plan | Refrigerated & Frozen | Severance and related costs | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 2.5   2.5   2.5 2.5  
Recognized pre-tax expenses 0.0   0.1   0.6    
Conagra Restructuring Plan | Refrigerated & Frozen | Accelerated depreciation | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 12.1   12.1   12.1 12.1  
Recognized pre-tax expenses 0.5   0.9   1.7    
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 0.0  
Recognized pre-tax expenses 0.0   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 0.1   0.1   0.1 0.1  
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 1.6   1.6   1.6 1.6  
Recognized pre-tax expenses 0.1   0.1   0.1    
Conagra Restructuring Plan | Refrigerated & Frozen | Selling, general and administrative expenses | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 4.2   4.2   4.2 4.2  
Recognized pre-tax expenses 0.1   0.2   0.7    
Conagra Restructuring Plan | Refrigerated & Frozen | Total | Reporting segments              
Restructuring Cost and Reserve [Line Items]              
Charges expected to be incurred 21.4   21.4   21.4 $ 21.4  
Recognized pre-tax expenses $ 0.8   $ 1.3   $ 2.6