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Pensions and Other Postretirement Benefits - Narrative (Details)
$ in Millions
12 Months Ended
Apr. 30, 2023
USD ($)
plan
Apr. 30, 2022
USD ($)
Apr. 30, 2021
USD ($)
Dec. 31, 2021
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
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      
Settlement loss (gain) $ 7.4 $ 10.8 $ 35.5  
Expected benefit payments for the defined benefit pension and other postretirement in 2024 40.4      
Expected benefit payments for the defined benefit pension and other postretirement in 2025 41.1      
Expected benefit payments for the defined benefit pension and other postretirement in 2026 35.0      
Expected benefit payments for the defined benefit pension and other postretirement in 2027 34.2      
Expected benefit payments for the defined benefit pension and other postretirement in 2028 33.5      
Expected benefit payments for the defined benefit pension and other postretirement in 2029 through 2033 $ 165.5      
Number of multiemployer pension plans | plan 1      
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost $ 2.0 2.6    
Multiemployer plan actual funded status       49.40%
Fiscal Year Two Thousand Twenty Four        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Multiemployer Plan, Pension, Significant, Future Employer Contribution, Amount $ 2.8      
Fixed income        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Approximate percentage of assets to be invested in company's current investment policy 80.00%      
Equity Securities        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Approximate percentage of assets to be invested in company's current investment policy 20.00%      
Other Postretirement Benefits Plan        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Settlement loss (gain) $ 0.0 0.0 0.0  
Other Postretirement Benefits Plan | United States [Member]        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Assumed health care trend rate for next fiscal year 6.40%      
Assumed health care trend rate for participants under age 65 5.00%      
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2032      
Other Postretirement Benefits Plan | CANADA        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Assumed health care trend rate for next fiscal year 4.50%      
Assumed health care trend rate for participants under age 65 4.50%      
Settlement loss (gain) $ 0.0 0.0    
Defined Benefit Pension Plans        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Settlement loss (gain) 7.4 10.8 35.5  
Expected amount to be contributed by the Company to the defined benefit pension plans in 2024 0.0      
Expected direct benefit payments to be made by the Company in 2024 9.8      
Defined Benefit Pension Plans | CANADA        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Defined Benefit Plan, Benefit Obligation, Payment for Settlement     (82.6)  
Defined Benefit Plan, Gain (Loss) Due to Settlement, 2021 Canada Buy-Out Contract 0.0 0.0 $ (29.6)  
Settlement loss (gain) $ 0.7 $ 0.0    
Minimum        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
High Quality Corporate Bonds with Duration Range 10 years      
Maximum        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
High Quality Corporate Bonds with Duration Range 13 years