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Retirement Benefits - Summary of Fair Value Assets in Defined Benefit Pension Plans (Detail) - USD ($)
$ in Thousands
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 17,732 $ 18,867
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   12,724  
Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4,845  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   163  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   17,732  
Level 1 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   7,326  
Level 1 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   2,326  
Level 1 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   1,743  
Level 1 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   702  
Level 1 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   627  
Level 1 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4,845  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   163  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 2 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 2 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 2 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 2 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 2 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 2 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 2 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Level 3 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 0