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Retirement Benefits - Summary of Fair Value Assets in Defined Benefit Pension Plans (Detail) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 17,732 $ 18,867 $ 21,459
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12,724 13,856  
Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,845 4,703  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 163 308  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17,732 18,867  
Level 1 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7,326 7,382  
Level 1 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,326 2,775  
Level 1 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,743 2,008  
Level 1 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 702 794  
Level 1 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 627 897  
Level 1 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,845 4,703  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 163 308  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0