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GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 22, 2015 | Feb. 22, 2015 | May 25, 2014
Goodwill [Line Items] |  |  |
Weighted average life in years of amortizing intangible assets |  | 21 years |
Amortization expense year one | $ 108.2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths | $ 108.2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |
Amortization expense year two | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |
Amortization expense year three | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |
Amortization expense year four | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |
Amortization expense year five | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive | 108.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |
Impairment | 1,290.0 us-gaap_GoodwillImpairmentLoss | 1,502.1 us-gaap_GoodwillImpairmentLoss |
Goodwill | 6,305.0 us-gaap_Goodwill | 6,305.0 us-gaap_Goodwill | 7,828.5 us-gaap_Goodwill
Bars and Coordinated |  |  |
Goodwill [Line Items] |  |  |
Impairment | 294.7 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_BarsandcoordinatedMember | 326.6 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_BarsandcoordinatedMember |
Goodwill | 2.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_BarsandcoordinatedMember | 2.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_BarsandcoordinatedMember |
Cereal |  |  |
Goodwill [Line Items] |  |  |
Impairment | 157.1 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_CerealMember | 175.3 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_CerealMember |
Goodwill | 289.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_CerealMember | 289.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_CerealMember |
Snacks |  |  |
Goodwill [Line Items] |  |  |
Impairment | 389.9 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_SnacksMember | 536.5 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_SnacksMember |
Goodwill | 276.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_SnacksMember | 276.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_SnacksMember |
Retail Bakery |  |  |
Goodwill [Line Items] |  |  |
Impairment | 154.4 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_RetailBakeryMember | 174.4 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_RetailBakeryMember |
Goodwill | 535.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_RetailBakeryMember | 535.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_RetailBakeryMember |
Pasta |  |  |
Goodwill [Line Items] |  |  |
Impairment | 157.1 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_PastaMember | 157.1 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_PastaMember |
Goodwill | 589.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PastaMember | 589.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PastaMember |
Condiments |  |  |
Goodwill [Line Items] |  |  |
Impairment | 132.2 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_CondimentsMember | 132.2 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_CondimentsMember |
Goodwill | 3.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_CondimentsMember | 3.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_CondimentsMember |
Private Brands |  |  |
Goodwill [Line Items] |  |  |
Discount Rate | 8.00%us-gaap_FairValueInputsDiscountRate / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |  |
Terminal Growth Rate | 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |  |
Impairment | 1,290.0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | 1,502.1 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |
Number of reporting units with fair value substantially less than carrying value | 4 cag_NumberofReportingUnitsWithFairValueSubstantiallyLessThanCarryingValue / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |  |
Goodwill | 1,695.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | 1,695.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | 3,214.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember
Impairment charges | $ 13.7 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | $ 43.7 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |
Number of brands impaired | 5 cag_NumberofBrandsImpaired / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |  |

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