Annual report pursuant to Section 13 and 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Detail)

v3.7.0.1
Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
$ / shares
Jan. 31, 2017
$ / shares
Oct. 31, 2016
$ / shares
Jul. 31, 2016
USD ($)
$ / shares
Apr. 30, 2016
USD ($)
$ / shares
Jan. 31, 2016
$ / shares
Oct. 31, 2015
$ / shares
Jul. 31, 2015
$ / shares
Apr. 30, 2017
USD ($)
$ / shares
Apr. 30, 2016
USD ($)
$ / shares
Apr. 30, 2015
USD ($)
$ / shares
Feb. 17, 2016
VEF / $
Feb. 16, 2016
VEF / $
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Investments in affiliated companies maximum 50.00%               50.00%        
Dividends received from unconsolidated subsidiary                 $ 564,000 $ 2,373,000 $ 1,656,000    
Deferred revenue $ 95,800,000       $ 95,900,000       95,800,000 95,900,000      
Impairment of long-lived assets                 0 0 0    
Impairment of goodwill                 0        
Impairment of intangible assets                 0 0      
Performance related bonus expenses                 $ 179,600,000 186,500,000 166,400,000    
Percentage that Actuarial gain or loss must exceed the greater of PBO or Market Value Plan Assets                 10.00%        
Foreign currency losses/(gains), after tax                 $ (200,000) 8,700,000 $ 1,600,000    
Foreign currency exchange rate, translation | VEF / $                       10.0 6.3
Venezuelan foreign currency loss                   $ 13,720,000      
Diluted (loss) earnings per share | $ / shares $ 0.47 $ 0.42 $ 0.52 $ 0.06 $ 0.10 $ (0.30) $ 0.35 $ 0.46 $ 1.47 $ 0.58 $ 1.76    
CSV of COLI Contracts                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Gross CSV $ 180,300,000       $ 175,700,000       $ 180,300,000 $ 175,700,000      
Outstanding policy loans 67,200,000       68,400,000       67,200,000 68,400,000      
Receivable on insolvency of insurance companies $ 61,300,000       $ 55,900,000       $ 61,300,000 $ 55,900,000      
Devaluation Of Venezuelan Bolivar                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Diluted (loss) earnings per share | $ / shares                   $ (0.26)      
Free-Floating Exchange Rate                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Foreign currency exchange rate, translation | VEF / $                       200  
Rate used to calculate the impact of devaluation                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Foreign currency exchange rate, translation | VEF / $                       260  
Accounting Standards Update 2015-03 | Restatement Adjustment                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Unamortized debt issuance costs       $ 4,200,000                  
Unamortized debt issuance costs, current       900,000                  
Unamortized debt issuance costs, non-current       $ 3,300,000                  
Minimum                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Intangible assets estimated useful lives                 1 year        
Minimum | Executive Capital Accumulation Plan                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Deferred compensation arrangement vesting period                 4 years        
Minimum | Software and Software Development Costs                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Property and equipment estimated useful life                 3 years        
Minimum | Other Capitalized Property Plant and Equipment                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Property and equipment estimated useful life                 3 years        
Maximum                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Intangible assets estimated useful lives                 24 years        
Maximum | Executive Capital Accumulation Plan                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Deferred compensation arrangement vesting period                 5 years        
Maximum | Software and Software Development Costs                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Property and equipment estimated useful life                 7 years        
Maximum | Other Capitalized Property Plant and Equipment                          
Organization And Summary Of Significant Accounting Policies [Line Items]                          
Property and equipment estimated useful life                 10 years