Income Taxes - Income from Continuing Operations and Income Tax Expense (Benefit) by Jurisdiction (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 03, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Tax Disclosure [Abstract]
Undistributed foreign earnings	$ 198.7
Components of Income/(Loss) Before Income Taxes [Abstract]
Domestic source	21.0	(1.2)	(32.4)
Foreign source	54.9	39.1	43.8
Income before income taxes	75.9	37.9	11.4
Current
Federal	0.2	0	0
Foreign	8.0	4.6	5.7
State	0.7	0.1	(0.5)
Subtotal	8.9	4.7	5.2
Deferred
Federal and state	(31.7)	0	0.1
Foreign	2.5	(7.2)	(2.1)
Subtotal	(29.2)	(7.2)	(2.0)
Income tax expense/(benefit)	$ (20.3)	$ (2.5)	$ 3.2