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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