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Income Taxes - Allocation of Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Apr. 28, 2013 | Jan. 27, 2013 | Oct. 28, 2012 | Jul. 29, 2012 | Apr. 29, 2012 | Jan. 29, 2012 | Oct. 30, 2011 | Jul. 31, 2011 | Apr. 28, 2013 | Apr. 29, 2012 | May 01, 2011
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
income from operations | $ 2,161 | $ 1,700 | $ (3,736) | $ 1,848 | $ 2,071 | $ 1,075 | $ (3,389) | $ 1,145 | $ 1,972 | $ 902 | $ (1,102)
shareholders' equity, related to the tax benefit arising from the exercise of stock options |  |  |  |  |  |  |  |  | (76) | (64) | (339)
income tax expense (benefit), excluding tax benefit from exercise of stock options |  |  |  |  |  |  |  |  | $ 1,896 | $ 838 | $ (1,441)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, excluding tax effect from exercise of stock options. + References No definition available. + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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