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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012
--- | --- | ---
Deferred tax assets: |  |
Accrued employee benefit expenses | $ 568 | $ 480
Allowance for doubtful accounts | 52 | 95
Deferred compensation | 1,688 | 1,446
Tax credits | 336 | 375
Unrecognized actuarial loss, defined benefit plans | 4,309 | 4,146
Other | 86 | 93
Total deferred tax assets | 7,039 | 6,635
Deferred tax liabilities: |  |
Book basis in excess of tax basis of property, plant and equipment | (1,953) | (2,166)
Prepaid pension | (2,260) | (2,180)
Other | 128 | 153
Total deferred tax liabilities | (4,085) | (4,193)
Less: valuation allowance | (59) | (73)
Net deferred tax assets (liabilities) | 2,895 | 2,369
Deferred tax assets classified in the balance sheet: |  |
Current | 654 | 713
Long-term | $ 2,241 | $ 1,656

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