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Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate (Detail) | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
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 | (9.10%) | (2.80%) | (4.20%)
COLI increase, net | (1.50%) | (2.90%) | (3.10%)
Conclusion of U.S. federal tax audit |  | (4.40%) |
Non-deductible operating expenses | 0.60% | 1.50% | 0.50%
Devaluation of Venezuelan currency |  | 7.40% |
Change in valuation allowance | (3.10%) | (6.20%) |
Change in uncertain tax positions |  | 1.30% | (0.10%)
Foreign source income, net of credits generated | (0.10%) | 0.50% | 0.40%
Other | 3.30% | 3.70% | (0.50%)
Effective income tax rate | 25.10% | 38.90% | 28.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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