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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
Jan. 31, 2020
USD ($)
Facility
Jan. 31, 2021
USD ($)
Segment
Jan. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]            
Number of line of business | Segment       4    
Credit loss for available for sales debt securities   $ 0 $ 0 $ 0 $ 0  
ROU assets, impairment charge     2,282,000   2,282,000  
Write-off of long-lived assets         2,654,000  
Impairment of long-lived assets   0   0   $ 0
Goodwill   625,549,000   625,549,000   613,943,000
Impairment of goodwill $ 0          
Performance-related bonus expenses   $ 68,400,000 $ 60,500,000 $ 200,400,000 $ 177,900,000  
ASU 2016-13            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted   true   true    
Change in accounting principle, accounting standards update, adoption date   May 01, 2020   May 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect   true   true    
ASU 2017-04            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted   true   true    
Change in accounting principle, accounting standards update, adoption date   May 01, 2020   May 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect   true   true    
ASU 2018-13            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted   true   true    
Change in accounting principle, accounting standards update, adoption date   May 01, 2020   May 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect   true   true    
ASU 2018-15            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted   true   true    
Change in accounting principle, accounting standards update, adoption date   May 01, 2020   May 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect   true   true    
ASU 2019-12            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted   true   true    
Change in accounting principle, accounting standards update, adoption date   May 01, 2020   May 01, 2020    
Change in accounting principle, accounting standards update, immaterial effect   true   true    
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    
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    
Consulting | Operating Segments            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Goodwill           $ 173,000,000.0
Acquired Companies            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Business acquisitions adjustment, increase in goodwill       $ 2,600,000    
Number of office leases closed | Facility     16      
ROU assets, impairment charge     $ 2,300,000      
Acquired Companies | Leasehold Improvements and Furniture and Fixtures            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Write-off of long-lived assets     $ 400,000      
Affiliated Entity            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Investments in affiliated companies maximum   50.00%   50.00%    
Mexican Subsidiary            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Percentage of Noncontrolling interest in subsidiary   51.00%   51.00%