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Contingencies and Commitments (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2013
Jun. 30, 2012
Sep. 30, 2011
Boarhead Farms
Mar. 31, 2013
Boarhead Farms
Aug. 18, 2008
Boarhead Farms
Jun. 30, 2008
Export Regulations Violations
item
Loss contingencies              
Additional accruals recorded   $ 0          
Environmental remediation liability   4.9 4.9        
Percentage of past remediating costs including prejudgment interest           80.00%  
Percentage of future remediating costs           80.00%  
Payments for settlement 21.8     21.8      
Additional liabilities incurred         $ 0    
Foreign nationals employed, exposed to protected technical data             40