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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
May 03, 2014
Apr. 27, 2013
Apr. 28, 2012
Allowance for uncollectible accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 1.0 $ 1.3 $ 1.1
Charged to Costs and Expenses 0 0.1 0.5
Charged to Other Accounts 0 0 0
Deductions 0.3 0.4 0.3
Balance at End of Period 0.7 1.0 1.3
Deferred tax valuation allowance
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 42.4 57.3 54.0
Charged to Costs and Expenses 1.9 0 14.8
Charged to Other Accounts 2.3 0 (1.3)
Deductions 32.6 14.9 10.2
Balance at End of Period $ 14.0 $ 42.4 $ 57.3