Pensions and Other Postretirement Benefits (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Apr. 30, 2014	Apr. 30, 2013
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]
Reduction in positions due to restructuring	850
Eligibility condition for covered employees to avail the benefits of unfunded, defined postretirement plans that provide health care and life insurance benefits	when they reach age 55 and have attained 10 years of credited service
Expected amount to be recognized during 2015 of amortization of net actuarial losses in net periodic benefit cost	$ 10.0
Expected amount to be recognized during 2015 in prior service cost as net periodic benefit cost	0.2
Money market holdings maturity period	Three months or less
Corporate bonds range	10 to 13 years
Company's common shares included in equity securities	317,552
Market value of company's common shares included in equity securities	30.7
Dividends paid on company's common shares included in equity securities	0.7
Expected benefit payments for the defined benefit pension and other postretirement in 2015	44.9
Expected benefit payments for the defined benefit pension and other postretirement in 2016	36.7
Expected benefit payments for the defined benefit pension and other postretirement in 2017	37.3
Expected benefit payments for the defined benefit pension and other postretirement in 2018	41.9
Expected benefit payments for the defined benefit pension and other postretirement in 2019	38.4
Expected benefit payments for the defined benefit pension and other postretirement in 2020 through 2024	216.1
Annual change in the assumed health care cost	One-percentage point
Equity Securities [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Approximate percentage of assets to be invested in company's current investment policy	47.00%
Fixed - Income Securities [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Approximate percentage of assets to be invested in company's current investment policy	47.00%
Cash and Other Investments [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Approximate percentage of assets to be invested in company's current investment policy	6.00%
Defined Benefit Pension Plans [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Expected amount to be contributed by the Company to the defined benefit pension plans in 2015	$ 4.5
Defined benefit plan, actual rate of return on plan assets	6.90%	12.60%
U. S. Other Postretirement Benefit Plans [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Assumed health care trend rate for next fiscal year	7.00%
U. S. Other Postretirement Benefit Plans [Member] \| U.S. plans in 2019 [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Assumed health care trend rate for partcipants under age 65	5.00%
Canadian Other Postretirement Benefit Plans [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Assumed health care trend rate for next fiscal year	5.50%
Canadian Other Postretirement Benefit Plans [Member] \| Canadian plans in 2017 [Member]
Schedule of defined benefit plans disclosures (Textual) [Abstract]
Assumed health care trend rate for partcipants under age 65	4.50%

Annual change in assumed health care cost.

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Assumed health care trend rate for participants under age sixty-five.

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Defined benefit plan, actual rate of retun on plan assets.

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Defined benefit plan dividend paid on equity securities issued by employer and related parties included in plan assets.

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- Definition

Defined benefit plan money market holding maturity period.

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High quality corporate bonds with duration range.

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- Definition

The amount of employer securities or securities of parties related to the employer that are included in plan assets.

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- Definition

Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ 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 (l)

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-Name Accounting Standards Codification

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- Definition

The number of employer shares or related party shares included in plan assets.

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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- Definition

General information regarding defined benefit plans. A defined benefit pension plan is a plan that defines an amount of pension benefit to be provided, usually as a function of one or more factors such as age, years of service, or compensation. An other postretirement defined benefit plan is an arrangement that is mutually understood by an employer and its employees, whereby an employer undertakes to provide its employees with benefits other than pensions, after they retire in exchange for their services over a specified period of time, upon attaining a specified age while in service, or a combination of both. Any plan that is not a defined contribution plan is a defined benefit plan. General descriptive information about the employer's defined benefit plans, including employee groups covered, type of benefit formula, type of benefits, cost sharing arrangements, funding policy, types of assets held, and significant nonbenefit liabilities, if any. Also includes information pertaining to multiple employer plans, which are accounted for as single-employer 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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Glossary Defined Benefit Postretirement Plan

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Defined Benefit Pension Plan

-URI http://asc.fasb.org/extlink&oid=6510300

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

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-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

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- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

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