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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 27, 2019 | Apr. 28, 2018
--- | --- | ---
Deferred taxes assets: |  |
Accrued warranty obligations | $ 5,912 | $ 7,282
Vacation accrual | 1,571 | 1,567
Deferred maintenance revenue | 716 | 392
Allowance for excess and obsolete inventory | 1,600 | 1,376
Equity compensation | 486 | 553
Allowance for doubtful accounts | 402 | 531
Inventory capitalization | 567 | 481
Accrued compensation and benefits | 549 | 651
Unrealized loss on foreign currency exchange | 0 | 37
Net operating loss carry forwards | 1,059 | 1,286
Research and development tax credit carry forwards | 1,299 | 334
Other | 1,647 | 1,042
Deferred tax assets, gross | 15,808 | 15,532
Valuation allowance | (893) | (1,506)
Deferred tax assets net of valuation | 14,915 | 14,026
Deferred tax liabilities: |  |
Property and equipment | (3,100) | (4,881)
Prepaid expenses | (476) | (486)
Intangible assets | (623) | (1,302)
Unrealized gain on foreign currency exchange | 6 | 0
Other | (75) | (41)
Deferred tax liabilities, gross | (4,280) | (6,710)
Deferred tax assets, net | $ 10,635 | $ 7,316

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