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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) (USD $) | Apr. 27, 2014 | Apr. 28, 2013 | Apr. 29, 2012 | May 01, 2011
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Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | $ 13,740,000 | $ 13,166,000 | $ 12,462,000 | $ 11,739,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized | 4,000,000 | 4,200,000 |  |
Gross amount of interest and penalties due to unrecognized tax benefits | 755,000 | 640,000 |  |
Unrecognized tax benefits for which significant change is reasonably possible | 13,700,000 |  |  |
Net Non-current Deferred Income Taxes [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | 9,700,000 | 8,900,000 |  |
Income Taxes Payable - Long-Term [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | $ 4,000,000 | $ 4,200,000 |  |

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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