Annual report pursuant to Section 13 and 15(d)

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

v3.20.2
Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Mar. 31, 2020
USD ($)
Nov. 01, 2019
USD ($)
Facility
Apr. 30, 2020
USD ($)
Segment
Facility
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]          
Number of business segments | Segment     4    
Dividends received from unconsolidated subsidiary     $ 346,000 $ 140,000 $ 240,000
Other-than-temporary impairment     0 0 0
ROU assets, impairment charge     2,282,000    
Write-off of long-lived assets     2,654,000    
Impairment of long-lived assets       0 0
Goodwill     613,943,000 578,298,000 584,222,000
Impairment of goodwill $ 0        
Impairment of intangible assets     0    
Purchase price allocated to indefinite lived trade name intangible assets       106,600,000  
Performance-related bonus expenses     $ 197,100,000 257,300,000 220,400,000
Percentage that Actuarial gain or loss must exceed the greater of PBO or Market Value Plan Assets     10.00%    
Cash surrender value of company owned life insurance policies, net of loans     $ 146,408,000 126,000,000  
Accounting Standards Update 2016-02          
Organization And Summary Of Significant Accounting Policies [Line Items]          
ROU assets     236,100,000    
Lease liability     272,300,000    
ROU asset adjusted by reclassification of pre-existing prepaid expenses and other assets     5,100,000    
ROU asset adjusted by reclassification of deferred rent     41,300,000    
CSV of COLI Contracts          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Cash surrender value of company owned life insurance policies, net of loans     146,400,000 126,000,000.0  
General and Administrative Expenses          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Impairment of intangible assets       106,600,000  
Foreign currency gains (losses)     (4,100,000) (1,700,000) (3,300,000)
Consulting | Operating Segments          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Goodwill     $ 173,014,000 $ 173,147,000 $ 173,453,000
Acquired Companies          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Number of office leases closed | Facility   16 16    
ROU assets, impairment charge   $ 2,300,000 $ 2,300,000    
Goodwill   $ 38,926,000      
Minimum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Intangible assets estimated useful lives     1 year    
Amortization of long-term retention awards     4 years    
Minimum | Executive Capital Accumulation Plan          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Deferred compensation arrangement vesting period     4 years    
Maximum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Intangible assets estimated useful lives     24 years    
Amortization of long-term retention awards     5 years    
Maximum | Executive Capital Accumulation Plan          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Deferred compensation arrangement vesting period     5 years    
Software and Software Development Costs | Minimum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     3 years    
Software and Software Development Costs | Maximum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     7 years    
Other Capitalized Property Plant and Equipment | Minimum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     3 years    
Other Capitalized Property Plant and Equipment | Maximum          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     10 years    
Leasehold Improvements And Furniture And Fixtures | Acquired Companies          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Write-off of long-lived assets     $ 400,000    
Mexican Subsidiary          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Percentage of Noncontrolling interest in subsidiary     51.00%    
Affiliated Entity          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Investments in affiliated companies maximum     50.00%