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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | May 02, 2020 | Apr. 27, 2019
--- | --- | ---
Deferred taxes assets: |  |
Accrued warranty obligations | $ 6,202 | $ 5,912
Vacation accrual | 1,753 | 1,571
Deferred maintenance revenue | 987 | 716
Allowance for excess and obsolete inventory | 1,318 | 1,340
Legal reserve | 503 | 260
Equity compensation | 396 | 486
Allowance for doubtful accounts | 546 | 402
Inventory capitalization | 822 | 567
Accrued compensation and benefits | 539 | 549
Net operating loss carry forwards | 919 | 1,059
Research and development tax credit carry forwards | 1,975 | 1,299
Lease accounting - lease liability | 2,099 | 0
Other | 1,035 | 1,647
Deferred tax assets, gross | 19,094 | 15,808
Valuation allowance | (1,189) | (893)
Deferred tax assets net of valuation | 17,905 | 14,915
Deferred tax liabilities: |  |
Property and equipment | (2,141) | (3,100)
Lease accounting - right of use asset | (2,103) | 0
Prepaid expenses | (440) | (476)
Intangible assets | (317) | (623)
Unrealized gain on foreign currency exchange | 17 | 6
Other | (68) | (75)
Deferred tax liabilities, gross | (5,086) | (4,280)
Deferred tax assets, net | $ 12,819 | $ 10,635

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on foreign currency transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 + Details
Name: | us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant