XML 76 R63.htm IDEA: XBRL DOCUMENT v3.5.0.1
Deferred Compensation And Retirement Plans (Expected Benefit Payments Associated With Future Service) (Detail)
$ in Thousands
Apr. 30, 2016
USD ($)
Deferred Compensation Plan  
Defined Benefit Plan Disclosure [Line Items]  
2017 $ 6,483
2018 6,275
2019 6,199
2020 6,451
2021 6,598
2022-2026 29,667
Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2017 325
2018 330
2019 328
2020 331
2021 324
2022-2026 1,480
Pension Plans, Defined Benefit | Hay Group  
Defined Benefit Plan Disclosure [Line Items]  
2017 1,785
2018 1,801
2019 1,844
2020 1,867
2021 1,933
2022-2026 9,942
Supplemental Pension Benefits | Hay Group  
Defined Benefit Plan Disclosure [Line Items]  
2017 112
2018 111
2019 110
2020 108
2021 107
2022-2026 508
Medical And Life Insurance | Hay Group  
Defined Benefit Plan Disclosure [Line Items]  
2017 684
2018 708
2019 735
2020 771
2021 795
2022-2026 $ 4,037