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Share-based Compensation and Equity - Special Cash Distribution (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 28, 2021
Dec. 31, 2021
Dec. 03, 2021
Nov. 01, 2021
Oct. 06, 2021
Sep. 15, 2021
Aug. 12, 2021
Mar. 08, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, par value (in dollars per share)   $ 0.004             $ 0.004
Dividends paid with due bills         $ 1,270,000        
Dividends paid $ 105,000                
Discontinued Operations, Disposed of by Sale | Walden e-Learning, LLC                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Amount receivable, noncurrent               $ 74,000  
Restricted cash held in escrow, released             $ 83,600    
Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Dividends (in dollars per share)     $ 0.58 $ 7.01          
Common stock, par value (in dollars per share)     $ 0.004     $ 0.004      
Dividends payable on vested stock units   $ 6,932