Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate (Detail)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Income Taxes [Line Items]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
Non-deductible transaction costs	5.80%
Foreign tax rates differential	(2.80%)	(4.20%)	(4.70%)
COLI increase, net	(2.90%)	(3.10%)	(2.90%)
Conclusion of U.S. federal tax audit	(4.40%)		(2.70%)
Non-deductible operating expenses	1.50%	0.50%	0.60%
Devaluation of Venezuelan currency	7.40%
Change in valuation allowance	(6.20%)		(1.40%)
Change in uncertain tax positions	1.30%	(0.10%)	1.10%
Foreign source income, net of credits generated	0.50%	0.40%	2.00%
Other	3.70%	(0.50%)	1.80%
Effective income tax rate	38.90%	28.00%	28.80%