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Pensions and Other Postretirement Benefits (Details 2)	12 Months Ended
	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%

X

- 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

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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



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-Section 50



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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



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-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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