Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail)

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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Defined Benefit Plan Disclosure [Line Items]      
Total liability $ 231,348 $ 234,059  
Deferred Compensation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of period 124,566 89,138 $ 86,577
Service cost 5,507    
Interest cost 3,820 3,423 2,989
Actuarial (gain) loss (4,791) 4,393 5,864
Acquisitions   39,079  
Settlements   (4,799)  
Benefits paid from plan assets (1,884) (595)  
Benefits paid from cash (6,176) (6,073) (6,292)
Benefit obligation, end of year 121,042 124,566 89,138
Fair value of plan assets, beginning of year 24,867    
Actual return on plan assets 2,463 (78)  
Benefits paid from plan assets (1,884) (595)  
Acquisitions   25,540  
Fair value of plan assets, end of year 25,446 24,867  
Funded status and balance, end of year [1] (95,596) (99,699) (89,138)
Current liability 6,182 5,845 5,832
Non-current liability 89,414 93,854 83,306
Total liability $ 95,596 $ 99,699 89,138
Plan assets weighted average allocation 100.00% 100.00%  
Deferred Compensation Plan | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 54.00% 64.00%  
Deferred Compensation Plan | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 46.00% 31.00%  
Deferred Compensation Plan | Other      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation   5.00%  
Executive Capital Accumulation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of period $ 105,676 $ 99,461  
Employee contributions 5,349 7,015  
Amortization of employer contributions 13,667 16,439  
Gain (loss) on investment 10,565 (1,654) 5,900
Benefits paid from cash (23,044) (15,201)  
Exchange rate fluctuations (629) (384)  
Benefit obligation, end of year 111,584 105,676 $ 99,461
Current liability 4,496 11,092  
Non-current liability 107,088 94,584  
Total liability $ 111,584 $ 105,676  
[1] The Company purchased COLI contracts insuring the lives of certain employees eligible to participate in the deferred compensation and pension plans as a means of funding benefits under such plans. As of April 30, 2017, 2016 and 2015, the Company held contracts with gross CSV of $180.3 million, $175.7 million and $172.3 million, offset by outstanding policy loans of $67.2 million, $68.4 million and $69.6 million, respectively.