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Federal, State and Local Income Taxes - Provision for income taxes differs from the amount of income tax determined by applying the applicable U.S. statutory income tax rate (Details 2)	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
U.S. statutory federal rate	35.00%	35.00%
Increase (decrease) in tax rate from:
State and local income taxes, net of federal income tax benefit	(3.57%)	2.37%
Effect of dividends received deductions	(0.32%)	(0.29%)
Domestic production tax credit	(0.63%)	(0.65%)
Other, net	0.09%	(1.57%)
Effective income tax rate	30.57%	34.86%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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