Income Taxes 5 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 29, 2012	Apr. 27, 2011	Apr. 28, 2010
Income Tax Disclosure [Abstract]
Balance at the beginning of the fiscal year	$ 70.7	$ 57.1	$ 86.6
Increases for tax positions of prior years	5.2	13.5	3.7
Decreases for tax positions of prior years	(18.0)	(26.0)	(35.4)
Increases based on tax positions related to the current year	3.7	10.8	10.4
Increases due to business combinations	0	26.9	0
Decreases due to settlements with taxing authorities	(2.2)	(5.4)	(0.8)
Decreases due to lapse of statute of limitations	(6.7)	(6.2)	(7.4)
Balance at the end of the fiscal year	$ 52.7	$ 70.7	$ 57.1