Share-based Compensation and Equity - Special Cash Distribution (Details) - USD ($)								12 Months Ended
	Nov. 30, 2023	Oct. 30, 2023	Nov. 17, 2022	Oct. 24, 2022	Oct. 12, 2022	Sep. 14, 2022	Dec. 28, 2021	Dec. 31, 2023	Dec. 31, 2022	Nov. 22, 2022	Dec. 31, 2021	Dec. 03, 2021	Oct. 06, 2021	Sep. 15, 2021
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							$ 105,000,000
Decrease in stock option price (in dollars per share)		$ 0.70		$ 0.68		$ 0.83
Cash to be paid upon vesting (in dollars per share)		0.70		0.68		$ 0.83
Amount receivable, noncurrent						$ 71,700,000
Dividends payable													$ 1,270,000,000
Restricted cash								$ 7,505,000	$ 8,617,000		$ 20,774,000
Dividends payable									$ 2,345,000		$ 3,930,000
Discontinued Operations, Disposed of by Sale | Walden e-Learning, LLC | Asset Pledged as Collateral
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount receivable, noncurrent														$ 74,000,000
Restricted cash														$ 83,600,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends (in dollars per share)		0.70		0.68		$ 0.83						$ 0.58		$ 7.01
Common stock, par value ( in dollars per share)		$ 0.004		$ 0.004		$ 0.004				$ 0.004		$ 0.004		$ 0.004
Dividends paid	$ 110,160,000		$ 112,000,000		$ 136,600,000
Aggregate cash to be paid if all units vest		$ 756,000
Dividends payable on vested stock units								$ 6,932,000