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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 26, 2014
Apr. 27, 2013
Deferred taxes assets:    
Warranty reserves $ 10,432 $ 9,847
Vacation accrual 1,510 1,788
Net losses on equity investments 2,870 3,066
Deferred maintenance revenue 1,332 2,439
Reserves for excess and obsolete inventory 981 1,246
Equity compensation 899 1,049
Allowance for doubtful accounts 797 599
Inventory capitalization 306 600
Accrued compensation and benefits 1,397 1,077
Intangible assets 56 37
Net operating loss carry forwards 766 0
Other 585 440
Deferred tax assets, gross 21,931 22,188
Valuation allowance on equity investments (2,297) 0
Deferred tax assets net of valuation 19,634 22,188
Deferred tax liabilities:    
Property and equipment (6,232) (7,542)
Prepaid expenses (574) (662)
Other (162) (168)
Deferred tax liabilities, gross (6,968) (8,372)
Deferred tax assets, net $ 12,666 $ 13,816