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Pensions and Other Postretirement Benefits (Details 2) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023
Defined Benefit Pension Plans | United States [Member] |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate used to determine benefit obligation | 5.43% | 5.19% | 4.59%
Discount rate used to determine service cost | 6.06% | 5.38% | 4.77%
Discount rate used to determine interest cost | 5.38% | 5.08% | 4.26%
Expected return on plan assets | 4.70% | 5.35% | 4.51%
Rate of compensation increase | 3.00% | 3.66% | 3.55%
Defined Benefit Pension Plans | CANADA |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate used to determine benefit obligation | 5.07% | 4.59% | 2.41%
Discount rate used to determine service cost | 0.00% | 0.00% | 0.00%
Discount rate used to determine interest cost | 5.04% | 4.65% | 2.33%
Expected return on plan assets | 0.00% | 3.30% | 1.60%
Defined Benefit Plan, Gain (Loss) Due to Settlement, 2021 Canada Buy-Out Contract | $ 0.0 | $ 3.2 |
Other Postretirement Benefits Plan | United States [Member] |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate used to determine benefit obligation | 5.86% | 5.15% | 4.52%
Discount rate used to determine service cost | 5.92% | 5.23% | 4.64%
Discount rate used to determine interest cost | 5.77% | 5.06% | 4.11%
Expected return on plan assets | 0.00% | 0.00% | 0.00%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Other Postretirement Benefits Plan | CANADA |  |  |
Weighted-average assumptions used in determining net periodic benefit costs: |  |  |
Discount rate used to determine benefit obligation | 5.12% | 4.62% | 4.50%
Discount rate used to determine service cost | 5.21% | 4.73% | 4.69%
Discount rate used to determine interest cost | 5.07% | 4.65% | 4.18%
Expected return on plan assets | 0.00% | 0.00% | 0.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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