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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | ---
Deferred tax assets |  |
Accrued liabilities and reserves | $ 11,522 | $ 8,593
Property and equipment depreciation | 15,914 | 12,846
Workers compensation | 10,540 | 9,536
Deferred compensation | 6,696 | 6,653
Equity compensation | 5,186 | 3,767
State net operating losses & tax credits | 973 | 626
Other | 1,582 | 1,787
Total gross deferred tax assets | 52,413 | 43,808
Less valuation allowance | 84 | 228
Total net deferred tax assets | 52,329 | 43,580
Deferred tax liabilities |  |
Property and equipment depreciation | (425,586) | (363,965)
Goodwill | (21,677) | (18,319)
Other | 0 | (738)
Total gross deferred tax liabilities | (447,263) | (383,022)
Net deferred tax liability | $ (394,934) | $ (339,442)

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