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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
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Income Taxes [Abstract] |  |  |
Deferred tax assets, accrued liabilities | $ 9,916 | $ 13,143 | $ 10,405
Deferred tax assets, deferred compensation | 6,050 | 5,663 | 5,325
Deferred tax assets, unrecognized tax benefits | 3,128 | 2,638 | 2,135
Deferred tax assets, state net operation loss | 3,902 | 4,395 | 2,771
Deferred tax assets, other | 1,016 | 611 | 656
Total gross deferred tax assets | 24,012 | 26,450 | 21,292
Deferred tax liabilities, excess of tax over book depreciation | (295,951) | (264,757) | (211,415)
Deferred tax liabilites, goodwill | (11,919) | (8,955) | (2,550)
Deferred tax liabilities, other | 66 |  |
Total gross deferred tax liabilities | (307,804) | (273,712) | (213,965)
Net deferred tax liabilities | $ (283,792) | $ (247,262) | $ (192,673)

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