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Income Taxes - Deferred Tax Assets (Liabilities) Related to Temporary Differences (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Deferred tax assets (liabilities):    
Net deferred tax (liability) $ (12,895) $ (25,620)
Non Current    
Deferred tax assets (liabilities):    
Net operating loss carryforwards and tax credits 3,372 2,902
Inventories 6,204 9,325
Accrued expenses, including compensation 3,037 8,194
Environmental reserves 258 279
Product liability 353 515
Accrued promotions 1,061 4,193
Workers' compensation 485 796
Warranty reserve 1,843 2,114
Stock-based compensation 3,576 4,734
State bonus depreciation 1,117 1,049
Property taxes (160) (189)
Property, plant, and equipment (18,434) (30,017)
Intangible assets (12,510) (27,032)
Pension 218 179
Other 21 130
Less valuation allowance $ (3,336) $ (2,792)