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Pensions and Other Postretirement Benefits (Details 2) | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
U. S. Defined Benefit Plans [Member] |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate | 4.42% | 3.99% | 4.70%
Expected return on plan assets | 6.72% | 6.75% | 7.00%
Rate of compensation increase | 4.13% | 4.13% | 4.12%
U. S. Other Postretirement Benefit Plans [Member] |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate | 4.27% | 3.80% | 4.70%
Expected return on plan assets | 0.00% | 0.00% | 0.00%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Canadian Defined Benefit Plans [Member] |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate | 4.11% | 3.65% | 4.20%
Expected return on plan assets | 5.64% | 5.78% | 6.17%
Rate of compensation increase | 3.00% | 3.00% | 4.00%
Canadian Other Postretirement Benefit Plans [Member] |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate | 4.10% | 3.70% | 4.20%
Expected return on plan assets | 0.00% | 0.00% | 0.00%
Rate of compensation increase | 0.00% | 0.00% | 0.00%

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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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