| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| REVENUE | 88.6 | 87.3 | 91.8 | 91.8 | 82.1 | 82.6 | 87.8 | 89.1 |
| REVENUE growth | 7.9% | 5.7% | 4.5% | 3.1% | 2.1% | 5.8% | 7.4% | 13.0% |
| COSTS AND EXPENSES: | | | | | | | | |
| Educational services and facilities | 40.0 | 38.1 | 36.5 | 39.9 | 36.1 | 36.2 | 34.8 | 38.1 |
| Selling, general and administrative | 51.8 | 50.3 | 42.9 | 47.0 | 45.8 | 46.7 | 40.8 | 45.2 |
| Gain on sale of assets | -30.9 | | 0.0 | 0.0 | -0.2 | | -22.5 | |
| Impairment of goodwill and long-lived assets | 4.2 | | | | | | | |
| Total costs & expenses | 65.1 | 88.4 | 80.5 | 86.9 | 81.7 | 82.9 | 53.8 | 83.3 |
| OPERATING INCOME | 23.5 | -1.1 | 11.3 | 4.9 | 0.4 | -0.3 | 34.0 | 5.7 |
| Operating margin | 26.5% | -1.3% | 12.3% | 5.3% | 0.5% | -0.4% | 38.8% | 6.5% |
| |
| OTHER: | | | | | | | | |
| Interest income | 0.5 | 0.5 | | | | | | |
| Interest expense | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | -1.1 | -0.3 |
| INCOME (LOSS) BEFORE INCOME TAXES | 24.0 | -0.7 | 11.6 | 4.8 | 0.4 | -0.4 | 32.9 | 5.5 |
| PROVISION (BENEFIT) FOR INCOME TAXES | 6.8 | -0.6 | 3.0 | 1.3 | 0.1 | -0.6 | 8.9 | 1.6 |
| NET INCOME | 17.3 | -0.1 | 8.6 | 3.5 | 0.3 | 0.3 | 24.0 | 3.8 |
| PREFERRED STOCK DIVIDENDS | | | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS | 17.3 | -0.1 | 8.4 | 3.2 | 0.0 | 0.0 | 23.7 | 3.5 |
| |
| Basic | | | | | | | | |
| Net income (loss) per common share (in dollars per share) | $0.57 | | $0.26 | $0.10 | | | $0.74 | $0.11 |
| |
| Diluted | | | | | | | | |
| Net income (loss) per common share (in dollars per share) | $0.57 | | $0.26 | $0.10 | | | $0.74 | $0.11 |
| |
| Weighted average number of common shares outstanding: | | | | | | | | |
| Basic (in shares) | 30.1 | 30.0 | 25.9 | 25.4 | 26.0 | 25.7 | 25.1 | 25.1 |
| Diluted (in shares) | 30.4 | 30.0 | 25.9 | 25.4 | 26.0 | 25.7 | 25.1 | 25.1 |