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Note 7 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Deferred tax assets    
Accrued liabilities $ 23,292 $ 16,066
Deferred compensation 6,272 6,050
Equity compensation 3,598 916
Unrecognized tax benefits 3,113 3,128
State net operating losses and tax credits 2,757 3,902
Other 98 100
Total gross deferred tax assets 39,130 30,162
Total net deferred tax assets 39,130 30,162
Deferred tax liabilities    
Property and equipment depreciation (318,565) (295,951)
Goodwill (14,989) (11,919)
Other (307) 66
Total gross deferred tax liabilities (333,861) (307,804)
Net deferred tax liability $ (294,731) $ (277,642)