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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 28, 2018 | Apr. 29, 2017
--- | --- | ---
Deferred taxes assets: |  |
Accrued warranty obligations | $ 7,282 | $ 10,469
Vacation accrual | 1,567 | 2,100
Deferred maintenance revenue | 392 | 1,336
Allowance for excess and obsolete inventory | 1,376 | 1,254
Equity compensation | 553 | 848
Allowance for doubtful accounts | 531 | 677
Inventory capitalization | 481 | 354
Accrued compensation and benefits | 651 | 1,232
Unrealized loss on foreign currency exchange | 37 | 226
Net operating loss carry forwards | 1,286 | 1,772
Research and development tax credit carry forwards | 334 | 311
Other | 1,042 | 1,266
Deferred tax assets, gross | 15,532 | 21,845
Valuation allowance | (1,506) | (2,061)
Deferred tax assets net of valuation | 14,026 | 19,784
Deferred tax liabilities: |  |
Property and equipment | (4,881) | (6,762)
Prepaid expenses | (486) | (601)
Intangible assets | (1,302) | (1,809)
Other | (41) | (156)
Deferred tax liabilities, gross | (6,710) | (9,328)
Deferred tax assets, net | $ 7,316 | $ 10,456

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