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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