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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
May. 02, 2015
Apr. 26, 2014
Deferred taxes assets:    
Warranty reserves $ 10,038 $ 10,432
Vacation accrual 1,808 1,510
Net losses on equity investments 0 2,870
Deferred maintenance revenue 745 1,332
Reserves for excess and obsolete inventory 939 981
Equity compensation 828 899
Allowance for doubtful accounts 613 797
Inventory capitalization 531 306
Accrued compensation and benefits 1,124 1,397
Intangible assets 0 56
Deferred Tax Assets, Unrealized Currency Losses 554 206
Net operating loss carry forwards 791 766
Other 344 379
Deferred tax assets, gross 18,315 21,931
Valuation allowance on equity investments (52) (2,297)
Deferred tax assets net of valuation 18,263 19,634
Deferred tax liabilities:    
Property and equipment (7,249) (6,232)
Prepaid expenses (577) (574)
Other (34) (162)
Deferred tax liabilities, gross (7,860) (6,968)
Deferred tax assets, net $ 10,403 $ 12,666