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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
May 31, 2020 | May 26, 2019 | May 27, 2018 | May 28, 2017
Tax Credit Carryforward [Line Items] |  |  |  |
Statutory rate | 21.00% | 21.00% | 29.40% |
Effective tax rate for the fiscal year | 26.00% | 71.00% | 64.00% |
Tax reform/CARES Act benefit | $ 2,770 | $ 0 | $ 14,350 |
Excess tax deficits related to stock-based compensation | 400 | 200 |  |
Deferred tax asset valuation allowance | 6,770 | 4,116 |  |
Unrecognized tax benefits | 827 | $ 616 | $ 479 | $ 537
Unrecognized tax benefits that would change the effect tax rate if recognized | 700 |  |  |
Domestic Tax Authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 42,900 |  |  |
Operating loss carryforwards, not subject to expiration | 35,600 |  |  |
Tax credit carryforward amount | $ 2,200 |  |  |
Tax credit carryforward, period | 20 years |  |  |
Deferred tax asset valuation allowance | $ 400 |  |  |
Foreign Tax Authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 11,700 |  |  |
Deferred tax asset valuation allowance | 3,500 |  |  |
State and Local Jurisdiction |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax asset valuation allowance | 2,800 |  |  |
California |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 18,500 |  |  |
Tax credit carryforward amount | 2,100 |  |  |
Indiana |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 6,500 |  |  |
Other States, Tax Board |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 14,100 |  |  |
Minnesota |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforward amount | $ 400 |  |  |
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=84230637&loc=d3e32537-109319 + Details
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