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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2016
May 02, 2015
May 03, 2014
Allowance for uncollectible accounts      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 0.5 $ 0.7 $ 1.0
Charged to Costs and Expenses 0.1 0.1 0.0
Charged to Other Accounts— Describe 0.0 0.0 0.0
Deductions— Describe 0.1 0.3 0.3
Balance at End of Period 0.5 0.5 0.7
Deferred tax valuation allowance      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 2.0 $ 14.0 42.4
Charged to Costs and Expenses 1.9
Charged to Other Accounts— Describe 2.3
Deductions— Describe $ 0.7 $ 12.0 32.6
Balance at End of Period $ 1.3 $ 2.0 $ 14.0