Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans (Total Long-Term Benefit Obligations) (Detail)

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Deferred Compensation And Retirement Plans (Total Long-Term Benefit Obligations) (Detail) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items]    
Total benefit obligation $ 231,348 $ 234,059
Less: current portion of benefit obligation (11,443) (17,946)
Non-current benefit obligation 219,905 216,113
Deferred Compensation and Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Total benefit obligation 95,596 99,699
Medical and Life Insurance Plan    
Defined Benefit Plan Disclosure [Line Items]    
Total benefit obligation 12,147 13,006
International Retirement Plans    
Defined Benefit Plan Disclosure [Line Items]    
Total benefit obligation 12,021 15,678
Executive Capital Accumulation Plan    
Defined Benefit Plan Disclosure [Line Items]    
Total benefit obligation $ 111,584 $ 105,676