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Business Combinations (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Jun. 30, 2010
Jun. 30, 2011
Fiscal Year 2010 Q3 Acquisitions [Member]
Jun. 30, 2011
Fiscal Year 2010 Q3 Acquisitions [Member]
Jul. 27, 2010
Customer Relationships [Member]
American Italian Pasta Company [Member]
years
Jul. 27, 2010
Trademarks/brands [Member]
years
Jul. 27, 2010
Trademarks/brands [Member]
American Italian Pasta Company [Member]
Jun. 30, 2011
Sepps Gourmet Foods Ltd [Member]
Jul. 27, 2010
American Italian Pasta Company [Member]
Sep. 30, 2010
American Italian Pasta Company [Member]
Jun. 30, 2011
J.T. Bakeries Inc. And North American Banking Ltd. [Member]
Date of acquisition             June 25, 2010 July 27, 2010   May 31, 2010
Number of businesses acquired 3                  
Net sales from acquisition included in statement of earnings   $ 20.4 $ 92.2              
Operating profit from acquisition included in statement of earnings   0.3 3.0              
Amortization expense   1.0                
Cash paid per common stock               $ 53.00    
Acquired finite-lived intangible assets       372.2   12.2        
Other intangible assets         193.0          
Weighted-average useful life (years)       16 15          
Acquired indefinite-lived intangible assets           180.8        
Inventory valuation adjustment               $ 3.9 $ 3.9