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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