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Income Taxes - Deferred Tax Assets (Deferred Tax Liabilities) Related to Temporary Differences (Detail) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Deferred tax assets (liabilities):    
Net deferred tax (liability) $ (25,620) $ (12,161)
Non Current    
Deferred tax assets (liabilities):    
Net operating loss carryforwards and tax credits 2,902 2,712
Inventories 9,325 8,789
Accrued expenses, including compensation 8,194 7,255
Environmental reserves 279 264
Product liability 515 748
Accrued promotions 4,193 2,463
Workers' compensation 796 1,082
Warranty reserve 2,114 3,194
Stock-based compensation 4,734 3,295
State bonus depreciation 1,049 937
Property taxes (189) (140)
Property, plant, and equipment (30,017) (27,006)
Intangible assets (27,032) (14,289)
Pension 179 123
Other 130 973
Less valuation allowance $ (2,792) $ (2,561)