Annual report pursuant to Section 13 and 15(d)

Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate (Detail)

v2.4.0.6
Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate (Detail)
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Income Taxes [Line Items]      
U.S. federal statutory income tax rate 35.00% 35.00% 35.00%
Foreign source income, net of credits generated 0.60% 3.00% 1.90%
Foreign tax rates differential (3.70%) (2.90%) (3.80%)
COLI increase, net (4.80%) (2.70%) (2.80%)
Repatriation of foreign earnings (3.20%) (1.70%) 0.10%
State income taxes, net of federal benefit 5.70% 4.00% 4.60%
Adjustments for valuation allowance (0.40%) (0.70%) 4.80%
Non-deductible business acquisition transaction costs 1.30%    
Expense disallowances 1.10% 0.80% 0.50%
Change in uncertain tax positions 1.90%   (2.30%)
Other 1.30% 0.30% (1.60%)
Effective income tax rate 34.80% 35.10% 36.40%