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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income taxes at the statutory rates	35.00%	35.00%	35.00%
Federal tax credits	(2.10%)	(1.20%)	(0.80%)
State income taxes, net of federal tax benefit	2.90%	2.90%	2.10%
Other	0.60%	0.70%	(0.70%)
Effective income tax rate, total	36.40%	37.40%	35.60%

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

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