Revenue from Contracts with Customers (Narrative 2) (Details) - Long-term Contract with Customer [Member] - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 $ in Millions |
Jun. 30, 2025
USD ($)
|
|---|---|
| Kaplan International [Member] | |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |
| Revenue, Remaining Performance Obligation, Amount | $ 258.9 |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 4 years |
| Supplemental Education [Member] | |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |
| Revenue, Remaining Performance Obligation, Amount | $ 6.1 |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months |