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Goodwill and Other Identifiable Intangible Assets (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
May 29, 2011
May 30, 2010
May 31, 2009
Aug. 31, 2010
American Pie LIC [Member]
May 29, 2011
American Pie LIC [Member]
May 29, 2011
American Pie LIC [Member]
Consumer Foods [Member]
May 30, 2010
Elan Nutrition, Inc [Member]
May 30, 2010
Elan Nutrition, Inc [Member]
May 30, 2010
Elan Nutrition, Inc [Member]
Consumer Foods [Member]
Nov. 23, 2008
Lamb Weston BSW [Member]
May 31, 2009
Lamb Weston BSW [Member]
May 31, 2009
Lamb Weston BSW [Member]
Commercial Foods [Member]
Goodwill and Other Identifiable Intangible Assets (Additional Textuals) [Abstract]                        
Purchase price allocated to goodwill       $ 51.5   $ 51.5 $ 66.4 $ 66.4   $ 18.8 $ 18.8  
Acquired intangible assets 18.0     61.3 61.3   33.6   33.6 11.1   11.1
Goodwill and Other Identifiable Intangible Assets (Textuals) [Abstract]                        
Weighted average life in years of amortizing intangible assets 13                      
Estimated amortization expenses, fiscal year 2012 18.3                      
Estimated amortization expenses, fiscal year 2013 16.5                      
Estimated amortization expenses, fiscal year 2014 16.5                      
Estimated amortization expenses, fiscal year 2015 16.5                      
Estimated amortization expenses, fiscal year 2016 14.4                      
Recognized amortization expense $ 17.8 $ 7.8 $ 6.6