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Revenue Recognition - Narrative (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
term
course
Graduation Fund [Line Items]  
Number of free courses 1
Number of successfully completed courses 3
Consecutive terms of non attendance in which Graduation Fund credits will be lost | term 1
Expected collection period of tuition receivable 12 months
Graduation fund estimated to be redeemed | $ $ 19.4
Minimum  
Graduation Fund [Line Items]  
Expected collection period of tuition receivable, noncurrent 2 years
Minimum | Australia / New Zealand  
Graduation Fund [Line Items]  
Deferred acquisition costs, amortization period 1 year
Maximum  
Graduation Fund [Line Items]  
Expected collection period of tuition receivable, noncurrent 4 years
Maximum | Australia / New Zealand  
Graduation Fund [Line Items]  
Deferred acquisition costs, amortization period 2 years