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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
May 30, 2021 | May 31, 2020 | May 26, 2019 | May 27, 2018
Tax Credit Carryforward [Line Items] |  |  |  |
Effective tax rate for the fiscal year | (19.29%) | (25.56%) | 70.66% |
Researach and development tax credit carryforward |  | $ 2,800 |  |
Tax reform/CARES Act benefit | $ 0 | 2,770 | $ 0 |
Deferred tax asset valuation allowance | 10,460 | 6,770 |  |
Unrecognized tax benefits | 942 | $ 827 | $ 616 | $ 479
Unrecognized tax benefits that would change the effect tax rate if recognized | 800 |  |  |
Domestic Tax Authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 68,100 |  |  |
Tax credit carryforward amount | $ 2,600 |  |  |
Tax credit carryforward, period | 20 years |  |  |
Deferred tax asset valuation allowance | $ 1,400 |  |  |
Foreign Tax Authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 14,800 |  |  |
Deferred tax asset valuation allowance | 4,900 |  |  |
State and Local Jurisdiction |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax asset valuation allowance | 4,200 |  |  |
California |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 24,200 |  |  |
Tax credit carryforward amount | 2,000 |  |  |
Indiana |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 10,400 |  |  |
Other States, Tax Board |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 16,700 |  |  |
Minnesota |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforward amount | $ 1,200 |  |  |
Tax credit carryforward, period | 15 years |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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