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Acquisitions (Details) - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 29, 2021
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2022
Oct. 31, 2021
Apr. 30, 2022
Business Acquisition [Line Items]            
Revenue, net   $ 514,836,000 $ 533,003,000 $ 1,002,405,000 $ 1,021,391,000  
Operating income (loss)   57,439,000 $ 73,888,000 40,474,000 114,856,000  
Goodwill   1,268,312,000   1,268,312,000   $ 1,302,142,000
Payments to acquire business, net of cash acquired       96,000 $ 13,615,000  
Education Services            
Business Acquisition [Line Items]            
Goodwill   192,499,000   192,499,000   193,590,000
Research            
Business Acquisition [Line Items]            
Goodwill   583,999,000   583,999,000   610,416,000
XYZ Media            
Business Acquisition [Line Items]            
Fair value of consideration transferred $ 45,400,000          
Total cash consideration transferred 38,000,000          
Intangible assets, net $ 22,700,000          
XYZ Media | Class A common stock            
Business Acquisition [Line Items]            
Issuance of common shares in consideration transferred (in shares) 129          
Issuance of common shares in consideration transferred $ 7,400,000          
XYZ Media | Education Services            
Business Acquisition [Line Items]            
Revenue, net   2,900,000   5,400,000    
Operating income (loss)   (800,000)   (2,300,000)    
Goodwill $ 22,200,000          
Other Acquisitions            
Business Acquisition [Line Items]            
Fair value of consideration transferred           41,200,000
Total cash consideration transferred           36,200,000
Intangible assets, net   15,600,000   15,600,000    
Cash to be paid after acquisition date           5,000,000
Cash acquired from acquisition           1,200,000
Payments to acquire business, net of cash acquired           $ 34,900,000
Other Acquisitions | Education Services            
Business Acquisition [Line Items]            
Goodwill   0   0    
Other Acquisitions | Research            
Business Acquisition [Line Items]            
Revenue, net   4,500,000   9,100,000    
Operating income (loss)   200,000   (2,100,000)    
Goodwill   $ 24,800,000   $ 24,800,000