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Income Taxes - Components of Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Current deferred tax assets |  |
Accrued marketing programs | $ 169 | $ 55
Accrued warranty expense | 1,464 | 1,466
Accrued workers' compensation | 650 | 638
Accrued vacation | 329 | 319
Other | 223 | 143
Gross current deferred tax assets | 2,835 | 2,621
Noncurrent deferred tax assets |  |
Liability for certain post-retirement benefits | 2,061 | 2,252
Accrued warranty expense | 792 | 876
Federal net operating loss carryforward | 30,488 | 26,616
Federal tax credit carryforward | 1,345 | 1,205
State net operating loss carryforward | 7,860 | 7,380
Depreciation | 854 | 735
Other | (32) | (43)
Gross noncurrent deferred tax assets | 43,368 | 39,021
Total gross deferred tax assets | 46,203 | 41,642
Valuation allowance | (46,203) | (41,642)
Net deferred tax assets | $ 0 | $ 0

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