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Income Taxes - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Apr. 28, 2018 | Jan. 31, 2018 | Apr. 29, 2017 | Jan. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense |  |  | $ 181,000 |  | $ 147,000 |
Prior period tax benefits recognized upon completion of R&D study |  |  | 78,000 |  | 71,000 |
Income tax benefit from windfall of stock |  |  | 30,000 |  | $ 14,000 |
Cumulative unrecognized tax benefits |  |  | 626,000 | $ 665,000 |  | $ 665,000
Developments affecting unrecognized tax benefits |  |  | $ 0 |  |  |
United States federal statutory income tax rate | 21.00% | 35.00% |  |  |  |
One-time non-cash charge related to re-measurement of deferred tax assets |  |  |  | $ 1,000,000 |  |
Provisional expense recorded for Transition Tax |  |  |  |  |  | $ 100,000
Percentage of deduction on income tax liability |  |  | 50.00% |  |  |
Percentage of effect on taxable income due to Tax Act |  |  | 80.00% |  |  |

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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate used to calculate effect of the Tax Cuts and Jobs Act of 2017 in the period of enactment. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + 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 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: 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 + Details
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