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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Jan. 26, 2019 | Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax assets, gross |  |  | $ 15,808 | $ 15,532 |
Deferred tax asset valuation allowance |  |  | 893 | 1,506 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | $ 2,775 | 2,741 | 139 |
Deferred Other Tax Expense (Benefit) |  | $ 480 | 471 |  |
Tax Cuts and Jobs Act of 2017, Complete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense |  |  |  | 3,534 |
Tax Cuts And Jobs Act of 2017, Complete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense |  |  |  | $ 285 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  | 30.40% | 35.00%
Accrued interest or penalties |  |  | 26 | $ 238 |
International |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | 5,722 |  |
Deferred tax assets, gross |  |  | 1,059 |  |
Ireland and Belgium [Domain] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax asset valuation allowance |  |  | $ 687 |  |

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- Definition Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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