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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2013
Apr. 28, 2012
Deferred taxes assets:    
Warranty reserves $ 9,847 $ 8,425
Vacation accrual 1,788 1,821
Net losses on equity investments 3,066 2,971
Deferred maintenance revenue 2,439 1,738
Reserves for excess and obsolete inventory 1,246 1,021
Equity compensation 1,049 653
Allowance for doubtful accounts 599 473
Inventory capitalization 600 907
Accrued compensation and benefits 1,077 742
Intangible assets 37 81
Net operating loss carry forwards 0 15
Other 440 334
Deferred tax assets, gross 22,188 19,181
Deferred tax liabilities:    
Property and equipment (7,542) (8,817)
Prepaid expenses (662) (669)
Other (168) (219)
Deferred tax liabilities, gross (8,372) (9,705)
Deferred tax assets, net $ 13,816 $ 9,476