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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 29, 2017 | Apr. 30, 2016
--- | --- | ---
Deferred taxes assets: |  |
Accrued warranty obligations | $ 10,469 | $ 11,407
Vacation accrual | 2,100 | 1,963
Net losses on investments | 0 | 336
Deferred maintenance revenue | 1,336 | 341
Allowance for excess and obsolete inventory | 1,254 | 1,314
Equity compensation | 848 | 745
Allowance for doubtful accounts | 677 | 703
Inventory capitalization | 354 | 595
Accrued compensation and benefits | 1,232 | 1,015
Deferred Tax Assets, Unrealized Currency Losses | 226 | 0
Net operating loss carry forwards | 1,772 | 1,404
Tax Credit Carryforwards, Research | 311 | 1,005
Other | 1,266 | 617
Deferred tax assets, gross | 21,845 | 21,445
Valuation allowance | (2,061) | (1,673)
Deferred tax assets net of valuation | 19,784 | 19,772
Deferred tax liabilities: |  |
Property and equipment | (6,762) | (7,988)
Prepaid expenses | (601) | (631)
Intangible Assets | (1,809) | (1,479)
Unrealized Currency Transaction Gains | 0 | (931)
Other | (156) | (60)
Deferred tax liabilities, gross | (9,328) | (11,089)
Deferred tax assets, net | $ 10,456 | $ 8,683

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