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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 01, 2019
USD ($)
Facility
Jan. 31, 2020
USD ($)
Facility
Jan. 31, 2019
USD ($)
Jan. 31, 2020
USD ($)
Segment
Jan. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]            
Number of business segments | Segment       4    
Other-than-temporary impairment   $ 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 goodwill       0   $ 0
Impairment of intangible assets       0   $ 0
Purchase price allocated to indefinite lived trade name intangible assets     106,600,000   106,600,000  
Performance-related bonus expenses   60,500,000 $ 59,500,000 177,900,000 202,400,000  
Accounting Standards Update 2016-02            
Organization And Summary Of Significant Accounting Policies [Line Items]            
ROU assets   236,100,000   236,100,000    
Lease liability   $ 272,300,000   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    
General and Administrative Expenses            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Impairment of intangible assets         $ 106,600,000  
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    
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    
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   $ 2,300,000    
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   $ 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%