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Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Oct. 26, 2012
Nov. 01, 2012
Kanghui
Subsequent Event [Line Items]    
Subsequent event date Nov. 01, 2012  
Subsequent event description the Company acquired China Kanghui Holdings (Kanghui)  
Business Combinations    
Total consideration for business acquisition   $ 816
Transaction value net of acquirerd cash   $ 755