Acquisitions (Details) (American Pie LIC [Member], USD $) In Millions	3 Months Ended
Aug. 29, 2010
American Pie LIC [Member]
Acquisitions (Textuals) [Abstract]
Cash paid to acquire the entity	$ 131.0
Purchase price allocated to goodwill	51.5
Purchase price allocated to brands, trademarks and other intangibles	$ 61.3

Name:

cag_BusinessAcquisitionsPurchasePriceAllocationGoodwillAmount

Namespace Prefix:

cag

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

duration