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Additional Financial Information (Tables)
6 Months Ended
Oct. 01, 2011
Additional Financial Information [Abstract] 
Cash Interest and Taxes
 
                                 
    Three Months Ended     Six Months Ended  
    October 1,
 		    October 2,
 		    October 1,
 		    October 2,
 		 
    2011     2010     2011     2010  
    (millions)  
 
Cash paid for interest
  $ 2.2     $ 1.9     $ 7.1     $ 2.8  
                                 
Cash paid for income taxes
  $  13.9     $  89.0     $  25.3     $  123.9