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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Allowance for uncollectible accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 0.7 $ 1.0 $ 1.3
Charged to Costs and Expenses 0.1 0.0 0.1
Charged to Other Accounts— Describe 0.0 0.0 0.0
Deductions— Describe 0.3 0.3 0.4
Balance at End of Period 0.5 0.7 1.0
Deferred tax valuation allowance      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 14.0 42.4 57.3
Charged to Costs and Expenses   1.9 0.0
Charged to Other Accounts— Describe   2.3 0.0
Deductions— Describe $ 12.0 32.6 14.9
Balance at End of Period $ 2.0 $ 14.0 $ 42.4