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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | ---
Deferred tax assets: |  |
Accrued liabilities and reserves | $ 7,978 | $ 10,948
Property and equipment depreciation | 24,419 | 16,604
Workers compensation | 7,244 | 10,934
Deferred compensation | 3,846 | 5,916
Equity compensation | 7,158 | 6,923
Federal net operating losses | 2,769 | 0
State net operating losses & tax credits | 2,336 | 938
Other | 889 | 1,275
Total gross deferred tax assets | 56,639 | 53,538
Less valuation allowance | 47 | 60
Total net deferred tax assets | 56,592 | 53,478
Deferred tax liabilities: |  |
Property and equipment depreciation | (378,756) | (468,470)
Goodwill | (19,548) | (25,052)
Other | (234) | (80)
Total gross deferred tax liabilities | (398,538) | (493,602)
Net deferred tax liability | $ (341,946) | $ (440,124)

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