XML 50 R34.htm IDEA: XBRL DOCUMENT v3.21.2
Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2021
USD ($)
Oct. 31, 2020
USD ($)
Oct. 31, 2021
USD ($)
Segment
Oct. 31, 2020
USD ($)
Apr. 30, 2021
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]          
Number of business segments | Segment     7    
Number of line of business | Segment     4    
Credit loss for available for sales debt securities $ 0 $ 0 $ 0 $ 0  
Impairment of right of use assets 7,392,000   7,392,000    
Impairment of fixed assets 1,915,000   1,915,000    
Impairment of long-lived assets   0   0  
Impairment of goodwill     0   $ 0
Impairment of intangible assets     0   $ 0
Performance-related bonus expenses $ 119,200,000 $ 72,100,000 $ 215,200,000 132,000,000.0  
ASU 2021-01          
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, 2021   May 01, 2021    
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    
Leasehold Improvements and Furniture and Fixtures          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Impairment of fixed assets $ 1,900,000   $ 1,900,000    
Acquired Companies          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Business acquisitions adjustment, increase in goodwill       $ 2,600,000  
Mexican Subsidiary          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Percentage of Noncontrolling interest in subsidiary 51.00%   51.00%