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Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate (Detail)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Income Taxes [Line Items]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
Foreign source income, net of credits generated	2.00%	0.60%	3.00%
Foreign tax rates differential	(4.70%)	(3.70%)	(2.90%)
COLI increase, net	(2.90%)	(4.80%)	(2.70%)
Conclusion of U.S. federal tax audit	(2.70%)
Adjustment to repatriation plan	(0.60%)	(3.20%)	(1.70%)
State income taxes, net of federal benefit	1.50%	5.70%	4.00%
Adjustments for valuation allowance	(1.40%)	(0.40%)	(0.70%)
Non-deductible business acquisition transaction costs		1.30%
Expense disallowances	0.60%	1.10%	0.80%
Change in uncertain tax positions	1.10%	1.90%
Other	0.90%	1.30%	0.30%
Effective income tax rate	28.80%	34.80%	35.10%

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