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Income Taxes - Tax Credit Carryforwards (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 03, 2014	Apr. 27, 2013	Apr. 28, 2012
Tax Credit Carryforward [Line Items]
Federal and state	$ (31.7)	$ 0	$ 0.1
Valuation allowance	14.0	42.4
Federal Income Tax Expense (Benefit), Continuing Operations	8.1
State and Local Income Tax Expense (Benefit), Continuing Operations	2.7
Foreign tax credit carryforward	11.0	7.6
Research tax credits	0.6	0
Federal And State Operating Loss Carryforwards [Member]
Tax Credit Carryforward [Line Items]
Valuation allowance	2.6
Federal
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	25.0
State
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	93.0
Investment tax credit
Tax Credit Carryforward [Line Items]
Percentage of qualified expenditures subject to investment tax credit	30.00%
Amount of unused credits	22.9
Valuation allowance	$ 9.3

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

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