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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2016 | May 02, 2015 | Apr. 26, 2014
--- | --- | --- | ---
Deferred taxes assets: |  |  |
Accrued warranty obligations | $ 11,407 | $ 10,038 |
Vacation accrual | 1,963 | 1,808 |
Net losses on investments | 336 | 0 |
Deferred maintenance revenue | 341 | 745 |
Allowance for excess and obsolete inventory | 1,314 | 939 |
Equity compensation | 745 | 828 |
Allowance for doubtful accounts | 703 | 613 |
Inventory capitalization | 595 | 531 |
Accrued compensation and benefits | 1,015 | 1,124 |
Deferred Tax Assets, Unrealized Currency Losses | 0 | 554 |
Net operating loss carry forwards | 1,404 | 791 |
Tax Credit Carryforwards, Research | 1,005 | 0 |
Other | 617 | 344 |
Deferred tax assets, gross | 21,445 | 18,315 |
Valuation allowance | (1,673) | (52) | $ (2,297)
Deferred tax assets net of valuation | 19,772 | 18,263 |
Deferred tax liabilities: |  |  |
Property and equipment | (7,988) | (7,249) |
Prepaid expenses | (631) | (577) |
Intangible Assets | (1,479) | 0 |
Unrealized Currency Transaction Gains | (931) | 0 |
Other | (60) | (34) |
Deferred tax liabilities, gross | (11,089) | (7,860) |
Deferred tax assets, net | $ 8,683 | $ 10,403 |

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