Valuation And Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period	$ 0.5	$ 1.6	$ 3.1
Additions Charged (Credited) to Costs and Expenses	0.3	(0.8)	0
Reductions and Write-offs	0.4	0.3	1.5
Balance at End of Period	$ 0.4	$ 0.5	$ 1.6