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Income Taxes - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May. 02, 2015 | May. 02, 2015 | May. 03, 2014 | Apr. 27, 2013
Tax Credit Carryforward [Line Items] |  |  |  |
Unrecognized tax benefits attributable to book to tax differences in share-based compensation | $ 4,500,000 | $ 4,500,000 |  |
Deferred tax benefit related to release of foreign valuation allowance | 7,200,000 | 6,300,000 | $ (2,500,000) | $ 7,200,000
Deferred tax benefit related to release of state valuation allowance |  | 1,400,000 |  |
Valuation allowance | 2,000,000 | 2,000,000 | 14,000,000 |
Federal income tax benefit |  | 700,000 |  |
State income tax benefit |  | 3,800,000 |  |
Foreign tax credit carryforward | 3,700,000 | 3,700,000 | 11,000,000 |
Research tax credits | 0 | 0 | 600,000 |
Income taxes paid |  | 9,000,000 | 6,200,000 | $ 5,900,000
Tax provision on undistributed net income of foreign operations | 0 | 0 |  |
Undistributed foreign earnings | 276,000,000 | 276,000,000 |  |
Approximate additional income tax expense if undistributed earnings were distributed |  | 96,600,000 |  |
Unrecognized tax benefits | 900,000 | 900,000 | $ 600,000 |
Unrecognized tax benefits that, if recognized, would impact effective tax rate | 900,000 | 900,000 |  |
Accrued for interest on income tax matters | 100,000 | 100,000 |  |
Accrued for penalties on income tax matters | 0 | 0 |  |
Federal |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 2,100,000 | 2,100,000 |  |
State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | $ 80,600,000 | $ 80,600,000 |  |
Foreign tax authority | Investment tax credit | Malta |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Percentage of qualified expenditures subject to investment tax credit | 30.00% | 30.00% |  |
Amount of unused credits | $ 16,100,000 | $ 16,100,000 |  |
Federal and state operating loss carryforwards |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Valuation allowance | $ 1,200,000 | $ 1,200,000 |  |

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