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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Deferred tax assets |  |
Accrued liabilities and reserves | $ 8,593 | $ 16,830
Property and equipment depreciation | 12,846 | 11,788
Workers compensation | 9,536 | 8,501
Deferred compensation | 6,653 | 6,272
Equity compensation | 3,767 | 3,598
State net operating losses & tax credits | 626 | 2,757
Other | 1,787 | 3,265
Total gross deferred tax assets | 43,808 | 53,011
Less valuation allowance | 228 | 0
Total net deferred tax assets | 43,580 | 53,011
Deferred tax liabilities |  |
Property and equipment depreciation | (363,965) | (332,095)
Goodwill | (18,319) | (14,989)
Other | (738) | (658)
Total gross deferred tax liabilities | (383,022) | (347,742)
Net deferred tax liability | $ (339,442) | $ (294,731)

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