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Pensions and Other Postretirement Benefits - Narrative (Details)
$ in Millions
12 Months Ended
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
plan
Apr. 30, 2018
USD ($)
Dec. 31, 2018
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    
Expected amount to be recognized during 2020 of amortization of net actuarial losses in net periodic benefit cost   $ 7.7    
Expected amount to be recognized during 2020 in prior service cost as net periodic benefit cost   0.3    
Expected benefit payments for the defined benefit pension and other postretirement in 2020   49.5    
Expected benefit payments for the defined benefit pension and other postretirement in 2021   47.4    
Expected benefit payments for the defined benefit pension and other postretirement in 2022   47.0    
Expected benefit payments for the defined benefit pension and other postretirement in 2023   51.0    
Expected benefit payments for the defined benefit pension and other postretirement in 2024   46.4    
Expected benefit payments for the defined benefit pension and other postretirement in 2025 through 2029   $ 222.4    
Number of multiemployer pension plans | plan   1    
Multiemployer plan actual funded status       51.60%
Decrease in expected service and interest cost next fiscal year due to change in discount rate methodology     $ 4.3  
Big Heart [Member]        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Multiemployer plan contributions   $ 2.3 $ 2.0  
Big Heart [Member] | Scenario, Forecast [Member]        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Multiemployer plan contributions $ 2.2      
Fixed - Income Securities [Member]        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Approximate percentage of assets to be invested in company's current investment policy   60.00%    
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Assumed health care trend rate for next fiscal year   6.50%    
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   2026    
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]        
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%    
Defined Benefit Pension Plans [Member]        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
Defined benefit plan actual rate of return on plan assets   3.80% 5.40%  
Expected amount to be contributed by the Company to the defined benefit pension plans in 2020   $ 1.2    
Maximum        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
High Quality Corporate Bonds with Duration Range   P13Y    
Maximum        
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract]        
High Quality Corporate Bonds with Duration Range   P10Y