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Note 2 - Restructuring Activities - Restructuring Plan Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended 42 Months Ended
May 29, 2022
May 30, 2021
May 31, 2020
May 29, 2022
Restructuring and Related Cost, Expected Cost, Total $ 147.8     $ 147.8
Restructuring and Related Cost, Incurred Cost 0.6      
Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 11.0     11.0
Restructuring and Related Cost, Incurred Cost      
Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 148.4     148.4
Restructuring and Related Cost, Incurred Cost 29.4 $ 46.2 $ 64.4 142.2
Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total    
Restructuring and Related Cost, Incurred Cost      
Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 346.9     346.9
Restructuring and Related Cost, Incurred Cost 19.6 $ 31.7 $ 73.8 293.3
Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 269.8     269.8
Restructuring and Related Cost, Incurred Cost 19.6     265.6
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 72.8     72.8
Restructuring and Related Cost, Incurred Cost 14.1     72.8
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 10.0     10.0
Restructuring and Related Cost, Incurred Cost       5.2
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost       0.0
Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 11.0     11.0
Restructuring and Related Cost, Incurred Cost       11.0
Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost       0.0
Other Cost of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 10.1     10.1
Restructuring and Related Cost, Incurred Cost       7.6
Other Cost of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 1.7     0.0
Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 83.8     83.8
Restructuring and Related Cost, Incurred Cost 20.1     83.8
Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Costs Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 20.1     20.1
Restructuring and Related Cost, Incurred Cost       12.8
Costs Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 1.7     0.0
Severance And Related Costs [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 19.1     19.1
Restructuring and Related Cost, Incurred Cost 3.4     18.8
Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 4.7     4.7
Restructuring and Related Cost, Incurred Cost 2.3     4.4
Severance And Related Costs [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 119.4     119.4
Restructuring and Related Cost, Incurred Cost       118.1
Severance And Related Costs [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 112.2     112.2
Restructuring and Related Cost, Incurred Cost 0.8     112.2
Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 22.8     22.8
Restructuring and Related Cost, Incurred Cost (4.7)     22.8
Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Asset Impairment Net Of Gains On Disposal [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 28.6     28.6
Restructuring and Related Cost, Incurred Cost       1.1
Asset Impairment Net Of Gains On Disposal [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 2.5     2.5
Restructuring and Related Cost, Incurred Cost (5.8)     2.5
Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.5     0.5
Restructuring and Related Cost, Incurred Cost 0.4     0.5
Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.1     0.1
Restructuring and Related Cost, Incurred Cost 0.0     0.1
Contract And Lease Termination Expenses [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 26.1     26.1
Restructuring and Related Cost, Incurred Cost       17.9
Contract And Lease Termination Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 15.1     15.1
Restructuring and Related Cost, Incurred Cost (0.6)     15.1
Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 5.6     5.6
Restructuring and Related Cost, Incurred Cost 1.7     1.7
Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 5.6     5.6
Restructuring and Related Cost, Incurred Cost 1.7     1.7
Consulting And Professional Fees [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 113.5     113.5
Restructuring and Related Cost, Incurred Cost       110.3
Consulting And Professional Fees [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 111.7     111.7
Restructuring and Related Cost, Incurred Cost 19.3     108.6
Other Net [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 16.0     16.0
Restructuring and Related Cost, Incurred Cost 8.5     14.0
Other Net [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.6     0.6
Restructuring and Related Cost, Incurred Cost 0.1     0.3
Other Net [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 31.8     31.8
Restructuring and Related Cost, Incurred Cost       25.7
Other Net [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 20.9     20.9
Restructuring and Related Cost, Incurred Cost 4.2     19.8
Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 64.0     64.0
Restructuring and Related Cost, Incurred Cost 9.3     57.8
Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 11.0     11.0
Restructuring and Related Cost, Incurred Cost 4.1     6.5
Other Selling, General and Administrative Expenses [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 326.8     326.8
Restructuring and Related Cost, Incurred Cost       280.5
Other Selling, General and Administrative Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 269.8     269.8
Restructuring and Related Cost, Incurred Cost 17.9     265.6
Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Incurred Cost 29.4     141.6
Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Incurred Cost 4.1     6.5
Pension And Postretirement Nonservice Cost Income Member | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Incurred Cost       0.6
Pension And Postretirement Nonservice Cost Income Member | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Incurred Cost      
Accelerated Depreciation [Member] | Pinnacle Integration Restructuring Plan [Member]        
Restructuring and Related Cost, Expected Cost, Total 7.4     7.4
Restructuring and Related Cost, Incurred Cost       7.4
Accelerated Depreciation [Member] | Pinnacle Integration Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Expected Cost, Total 7.4     7.4
Restructuring and Related Cost, Incurred Cost       7.4
Grocery And Snacks [Member]        
Restructuring and Related Cost, Expected Cost, Total 88.6     88.6
Restructuring and Related Cost, Incurred Cost      
Grocery And Snacks [Member] | Conagra Restructuring Plan [Member]        
Restructuring and Related Cost, Incurred Cost 6.0      
Grocery And Snacks [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total    
Restructuring and Related Cost, Incurred Cost      
Grocery And Snacks [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]        
Restructuring and Related Cost, Incurred Cost 0.0      
Grocery And Snacks [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 51.6     51.6
Restructuring and Related Cost, Incurred Cost 0.3     8.8
Grocery And Snacks [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 33.2     33.2
Restructuring and Related Cost, Incurred Cost 1.2     33.2
Grocery And Snacks [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 5.4     5.4
Restructuring and Related Cost, Incurred Cost       0.6
Grocery And Snacks [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 8.7     8.7
Restructuring and Related Cost, Incurred Cost 3.9     8.7
Grocery And Snacks [Member] | Other Cost of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 3.7     3.7
Restructuring and Related Cost, Incurred Cost 0.0     2.3
Grocery And Snacks [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 41.9     41.9
Restructuring and Related Cost, Incurred Cost 5.1     41.9
Grocery And Snacks [Member] | Costs Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 9.1     9.1
Restructuring and Related Cost, Incurred Cost 0.0     2.9
Grocery And Snacks [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 11.6     11.6
Restructuring and Related Cost, Incurred Cost 1.2     11.6
Grocery And Snacks [Member] | Severance And Related Costs [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 1.4     1.4
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Grocery And Snacks [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 21.9     21.9
Restructuring and Related Cost, Incurred Cost (5.2)     21.9
Grocery And Snacks [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 27.8     27.8
Restructuring and Related Cost, Incurred Cost 0.0     0.3
Grocery And Snacks [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.4     0.4
Restructuring and Related Cost, Incurred Cost 0.4     0.4
Grocery And Snacks [Member] | Contract And Lease Termination Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 6.5     6.5
Restructuring and Related Cost, Incurred Cost 0.0     1.8
Grocery And Snacks [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Grocery And Snacks [Member] | Consulting And Professional Fees [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 1.0     1.0
Restructuring and Related Cost, Incurred Cost 0.2     0.9
Grocery And Snacks [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 12.8     12.8
Restructuring and Related Cost, Incurred Cost 7.6     12.6
Grocery And Snacks [Member] | Other Net [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 5.8     5.8
Restructuring and Related Cost, Incurred Cost 0.1     2.9
Grocery And Snacks [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 46.7     46.7
Restructuring and Related Cost, Incurred Cost 4.0     46.5
Grocery And Snacks [Member] | Other Selling, General and Administrative Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 42.5     42.5
Restructuring and Related Cost, Incurred Cost 0.3     5.9
Grocery And Snacks [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost 9.1     88.4
Grocery And Snacks [Member] | Pension And Postretirement Nonservice Cost Income Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost      
Grocery And Snacks [Member] | Accelerated Depreciation [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost       0.0
Refrigerated And Frozen [Member]        
Restructuring and Related Cost, Expected Cost, Total 46.5     46.5
Restructuring and Related Cost, Incurred Cost      
Refrigerated And Frozen [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total    
Restructuring and Related Cost, Incurred Cost      
Refrigerated And Frozen [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 21.4     21.4
Restructuring and Related Cost, Incurred Cost (1.2)     14.8
Refrigerated And Frozen [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 39.6     39.6
Restructuring and Related Cost, Incurred Cost 12.9     39.6
Refrigerated And Frozen [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 4.6     4.6
Restructuring and Related Cost, Incurred Cost       4.6
Refrigerated And Frozen [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 2.3     2.3
Restructuring and Related Cost, Incurred Cost 2.1     2.3
Refrigerated And Frozen [Member] | Other Cost of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 5.7     5.7
Restructuring and Related Cost, Incurred Cost 1.7     4.6
Refrigerated And Frozen [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 41.9     41.9
Restructuring and Related Cost, Incurred Cost 15.0     41.9
Refrigerated And Frozen [Member] | Costs Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 10.3     10.3
Restructuring and Related Cost, Incurred Cost 1.7     9.2
Refrigerated And Frozen [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 1.2     1.2
Restructuring and Related Cost, Incurred Cost (0.6)     1.2
Refrigerated And Frozen [Member] | Severance And Related Costs [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 4.3     4.3
Restructuring and Related Cost, Incurred Cost 1.0     4.4
Refrigerated And Frozen [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.8     0.8
Restructuring and Related Cost, Incurred Cost 0.5     0.8
Refrigerated And Frozen [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total (1.7)     (1.7)
Restructuring and Related Cost, Incurred Cost (5.7)     (1.7)
Refrigerated And Frozen [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Refrigerated And Frozen [Member] | Contract And Lease Termination Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 3.7     3.7
Restructuring and Related Cost, Incurred Cost 0.2     0.2
Refrigerated And Frozen [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Refrigerated And Frozen [Member] | Consulting And Professional Fees [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Refrigerated And Frozen [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 2.6     2.6
Restructuring and Related Cost, Incurred Cost 0.8     1.1
Refrigerated And Frozen [Member] | Other Net [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 4.8     4.8
Restructuring and Related Cost, Incurred Cost 1.6     2.7
Refrigerated And Frozen [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 4.6     4.6
Restructuring and Related Cost, Incurred Cost 0.7     3.1
Refrigerated And Frozen [Member] | Other Selling, General and Administrative Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 11.1     11.1
Restructuring and Related Cost, Incurred Cost (2.9)     5.6
Refrigerated And Frozen [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost 15.7     45.0
Refrigerated And Frozen [Member] | Pension And Postretirement Nonservice Cost Income Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost      
Refrigerated And Frozen [Member] | Accelerated Depreciation [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost       0.0
International [Member]        
Restructuring and Related Cost, Expected Cost, Total 1.4     1.4
Restructuring and Related Cost, Incurred Cost      
International [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total    
Restructuring and Related Cost, Incurred Cost      
International [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 4.1     4.1
Restructuring and Related Cost, Incurred Cost 20.5     4.1
International [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
International [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost       0.0
International [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
International [Member] | Other Cost of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.7     0.7
Restructuring and Related Cost, Incurred Cost 0.0     0.7
International [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
International [Member] | Costs Of Goods Sold [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.7     0.7
Restructuring and Related Cost, Incurred Cost 0.0     0.7
International [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 1.3     1.3
Restructuring and Related Cost, Incurred Cost 0.2     1.3
International [Member] | Severance And Related Costs [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 1.5     1.5
Restructuring and Related Cost, Incurred Cost (0.2)     1.5
International [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.1     0.1
Restructuring and Related Cost, Incurred Cost 0.0     0.1
International [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost (0.1)     0.0
International [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
International [Member] | Contract And Lease Termination Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.8     0.8
Restructuring and Related Cost, Incurred Cost (0.8)     0.8
International [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
International [Member] | Consulting And Professional Fees [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.8     0.8
Restructuring and Related Cost, Incurred Cost 19.1     0.8
International [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
International [Member] | Other Net [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.3     0.3
Restructuring and Related Cost, Incurred Cost 2.5     0.3
International [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 1.4     1.4
Restructuring and Related Cost, Incurred Cost 0.2     1.4
International [Member] | Other Selling, General and Administrative Expenses [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 3.4     3.4
Restructuring and Related Cost, Incurred Cost 20.5     3.4
International [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost 0.2     1.4
International [Member] | Pension And Postretirement Nonservice Cost Income Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost      
International [Member] | Accelerated Depreciation [Member] | Pinnacle Integration Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost       0.0
Foodservice [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.3     0.3
Restructuring and Related Cost, Incurred Cost      
Foodservice [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total    
Restructuring and Related Cost, Incurred Cost      
Foodservice [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Foodservice [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Foodservice [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Foodservice [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.3     0.3
Restructuring and Related Cost, Incurred Cost 0.3     0.3
Foodservice [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Foodservice [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Foodservice [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Foodservice [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.0     0.0
Restructuring and Related Cost, Incurred Cost 0.0     0.0
Foodservice [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Expected Cost, Total 0.3     0.3
Restructuring and Related Cost, Incurred Cost 0.3     0.3
Foodservice [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost $ 0.3     0.3
Foodservice [Member] | Pension And Postretirement Nonservice Cost Income Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]        
Restructuring and Related Cost, Incurred Cost