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Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate (Detail)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Income Taxes [Line Items]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
Foreign source income, net of credits generated	0.40%	2.00%	0.60%
Foreign tax rates differential	(4.20%)	(4.70%)	(3.70%)
COLI increase, net	(3.10%)	(2.90%)	(4.80%)
Conclusion of U.S. federal tax audit		(2.70%)
State income taxes, net of federal benefit	0.90%	1.50%	5.70%
Change in uncertain tax positions	(0.10%)	1.10%	1.90%
Other	(0.90%)	(0.50%)	0.10%
Effective income tax rate	28.00%	28.80%	34.80%

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