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Other Employee Benefit Plans (Details) - USD ($)
12 Months Ended
Jan. 01, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Company's contributions to 401(K) plan   $ 7,400,000 $ 7,600,000 $ 7,200,000
Common stock shares purchase price limit for employees as percentage of market value under Employee Stock Purchase Plan   90.00%    
Employee stock purchase plan maximum percentage of purchase employee can make on eligible compensation   10.00%    
Maximum number of shares available for purchase by participating employees (in shares)   2,500,000    
Australia / New Zealand        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long service leave expense   $ 8,400,000 $ 1,500,000  
Strategic Education, Inc. 401(k) Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of company matching contribution to 401(K) plan, first tier   100.00%    
Defined contribution plan employer matching contribution percent, first tier   2.00%    
Percentage of company matching contribution to 401(K) plan, second tier   50.00%    
Defined contribution plan employer matching contribution percent, second tier   2.00%    
Defined contribution plan maximum employer matching contribution percent   3.00%    
Strategic Education, Inc. 401(k) Plan | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum annual contribution to 401(k) plan by employees, effective January 1, 2022 $ 20,500