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Retirement Benefits - Summary of Fair Value Assets in Defined Benefit Pension Plans (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 19,035 $ 18,540 $ 17,198
Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,754 4,599  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19,035 18,540  
Level 1 | Large Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7,783 4,929  
Level 1 | Small/Mid Cap      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,160 2,405  
Level 1 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,054 1,889  
Level 1 | Emerging Markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 580    
Level 1 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,754 4,599  
Level 1 | Liquid Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 508 420  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 196 4,298  
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 | Fixed Income      
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 | 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 | Fixed Income      
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 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0