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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010
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Income Taxes [Abstract] |  |  |
Deferred tax assets, accrued liabilities | $ 13,143 | $ 10,405 | $ 9,417
Deferred tax assets, deferred compensation | 5,663 | 5,325 | 4,941
Deferred tax assets, other | 7,644 | 5,562 | 3,759
Total gross deferred tax assets | 26,450 | 21,292 | 18,117
Deferred tax liabilities, excess of tax over book depreciation | (264,757) | (211,415) | (145,433)
Deferred tax liabilities, other | (8,955) | (2,550) | (4,496)
Total gross deferred tax liabilities | (273,712) | (213,965) | (149,929)
Net deferred tax liabilities | $ (247,262) | $ (192,673) | $ (131,812)

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