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Income Taxes - Components of Net Noncurrent Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
May 31, 2017
May 31, 2016
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract]    
Accrued marketing programs $ 142 $ 181
Accrued warranty expense 2,979 2,888
Accrued workers' compensation 1,151 1,011
Accrued vacation 178 346
Liability for certain post-retirement benefits 1,762 1,850
Federal net operating loss carryforward 32,119 32,380
Federal tax credit carryforward 1,910 1,787
State net operating loss carryforward 7,566 7,717
Depreciation 684 714
Other 221 134
Total gross noncurrent deferred tax assets 48,712 49,008
Valuation allowance (48,660) $ (49,008)
Net noncurrent deferred tax assets $ 52