Income Taxes 5 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 28, 2013	Apr. 29, 2012	Apr. 27, 2011
Income Tax Disclosure [Abstract]
Balance at the beginning of the fiscal year	$ 52.7	$ 70.7	$ 57.1
Increases for tax positions of prior years	1.9	5.2	13.5
Decreases for tax positions of prior years	(8.6)	(18.0)	(26.0)
Increases based on tax positions related to the current year	13.9	3.7	10.8
Unrecognized Tax Benefits, Increases Resulting from Acquisition	0	0	26.9
Decreases due to settlements with taxing authorities	(4.1)	(2.2)	(5.4)
Decreases due to lapse of statute of limitations	(10.4)	(6.7)	(6.2)
Balance at the end of the fiscal year	$ 45.4	$ 52.7	$ 70.7

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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