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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2013
Apr. 28, 2012
Deferred tax liabilities    
Accelerated tax depreciation $ 4,161 $ 2,664
Unremitted earnings 751 9,539
Deferred income 1,130 1,212
Deferred tax liabilities 6,042 13,415
Deferred tax assets    
Deferred compensation and stock award amortization 6,096 4,472
Inventory valuation differences 1,877 1,488
Property valuation differences 790 5,282
Accelerated book amortization 12,714 15,112
Environmental reserves 1,132 1,152
Bad debt reserves 243 591
Vacation accruals 986 963
Restructuring accruals 0 0
Foreign investment tax credit 21,469 24,303
Net operating loss carryovers 11,802 24,520
Foreign tax credit 7,661 1,393
Other accruals 1,160 888
Deferred tax assets, gross 65,930 80,164
Less valuation allowance 42,436 57,279
Total deferred tax assets 23,494 22,885
Net deferred tax assets 17,452 9,470
Balance sheet classification    
Current asset 3,313 3,529
Non-current asset 14,767 15,072
Current liability (628) (9,131)
Unrecognized tax benefits attributable to book to tax differences in share-based compensation $ 393