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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (Parenthetical) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Oct. 27, 2012
Apr. 28, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Unrealized loss on marketable securities arising during the period, tax $ 0 $ 0
Reclassification adjustment for gain on marketable securities included in net income, tax 0.3 0.2
Change in fair value of cash flow hedge, tax 0.1  
Net pension amortization and net actuarial loss, tax   7.5
Net pension amortization $ 0.6