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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Apr. 30, 2015
Defined Benefit Plan Disclosure [Line Items]          
Gain on cash surrender value of life insurance policies     $ 1,801 $ 8,498  
Defined benefit pension plan, non-current $ 203,378   203,378   $ 173,432
Gain (loss) on marketable securities (7,100) $ (200) (8,904) 4,328  
CSV of Coli Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Gross CSV 173,200   173,200   172,300
Outstanding policy loans 68,400   68,400   $ 69,600
Gain on cash surrender value of life insurance policies (1,500) 3,000 1,801 8,498  
Executive Capital Accumulation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Company's contributions 1,200 500 $ 23,200 $ 19,100  
Deferred compensation arrangement vesting period     4 years 4 years  
Loss (gain) on deferred compensation plan (5,300) $ (400) $ (6,200) $ 2,300  
Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit pension plan current and non-current 44,700   44,700    
Compensation and Benefits Payable | Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit pension plan, current 12,900   12,900    
Deferred Compensation and Other Retirement Plans | Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit pension plan, non-current $ 31,800   $ 31,800