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Retirement Benefits - Summary of Fair Value Assets in Defined Benefit Pension Plans (Detail) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 18,867 $ 21,459 $ 17,316
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13,856 14,814  
Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,703 6,314  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 308 331  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18,867 21,459  
Level 1 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7,382 7,726  
Level 1 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,775 3,128  
Level 1 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,008 2,173  
Level 1 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 794 862  
Level 1 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 897 925  
Level 1 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,703 6,314  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 308 331  
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