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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