| In millions, except per share items | Jun-30-23 | Jun-30-22 | Jun-30-21 | Jun-30-20 | Jun-30-19 | Jun-30-18 | Jun-30-17 | Jun-30-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenue | 1,450.8 | 1,381.8 | 899.2 | 866.4 | 1,013.8 | 960.3 | 1,207.9 | 1,080.1 |
| Revenue growth | 5.0% | 53.7% | 3.8% | -14.5% | 5.6% | -20.5% | 11.8% | -43.4% |
| Operating cost and expense: | | | | | | | | |
| Cost of educational services | 648.5 | 659.8 | 457.9 | 457.2 | 471.8 | 461.6 | 638.2 | 569.0 |
| Student services and administrative expense | 586.0 | 566.5 | 292.5 | 280.3 | 359.3 | 327.7 | 369.0 | 352.6 |
| Restructuring expense | 18.8 | 25.6 | 6.9 | 23.7 | 53.1 | 3.9 | 13.0 | 2.4 |
| Business acquisition and integration expense | 42.7 | 53.2 | 31.6 | | | | | |
| Gain on sale of assets | -13.3 | | | -287.6 | -33.6 | | | |
| Total operating cost and expense | 1,282.7 | 1,305.1 | 788.8 | 756.4 | 858.0 | 793.1 | 1,072.4 | 924.0 |
| Operating income | 168.2 | 76.7 | 110.4 | 110.1 | 155.8 | 167.2 | 135.5 | 156.1 |
| Operating margin | 11.6% | 5.6% | 12.3% | 12.7% | 15.4% | 17.4% | 11.2% | 14.5% |
| |
| Other income (expense): | | | | | | | | |
| Interest expense | -63.1 | -129.3 | -41.4 | | | | | -5.9 |
| Other income, net | 7.0 | 1.1 | 6.7 | 94.9 | -16.1 | -11.0 | | |
| Income (loss) from continuing operations before income taxes | 112.0 | -51.5 | 75.8 | 205.0 | | | 131.3 | 150.8 |
| (Provision for) benefit from income taxes | -10.3 | 15.5 | -12.3 | 14.9 | -32.9 | -88.1 | 9.6 | -25.3 |
| Income (loss) from continuing operations | 101.8 | -36.0 | 63.4 | 219.9 | 107.2 | 68.4 | 120.0 | 125.1 |
| |
| Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent [Abstract] | | | | | | | | |
| (Loss) income from discontinued operations before income taxes | -8.5 | -1.0 | 9.3 | -30.4 | 15.8 | -81.7 | 3.1 | -168.1 |
| Benefit from (provision for) income taxes | 3.6 | -125.6 | -3.2 | 12.2 | 6.5 | 48.0 | -0.8 | 39.9 |
| (Loss) income from discontinued operations | -8.4 | 346.9 | 6.1 | -305.7 | -11.3 | -33.6 | 2.3 | -128.3 |
| Net income | 93.4 | 311.0 | 69.6 | 134.1 | 202.5 | 102.2 | 123.3 | 122.7 |
| Net income | 93.4 | 311.0 | 70.0 | -85.3 | 95.2 | 33.8 | 122.3 | -3.2 |
| |
| Amounts attributable to Adtalem: | | | | | | | | |
| Continuing operations | 101.8 | -36.0 | 63.4 | 219.9 | 107.2 | 68.4 | 120.0 | 125.1 |
| Net (loss) income from discontinued operations | -8.4 | 346.9 | 6.6 | -305.3 | -12.1 | -34.7 | 2.3 | -128.3 |
| Net income | 93.4 | 311.0 | 70.0 | -85.3 | 95.2 | 33.8 | 122.3 | -3.2 |
| |
| Earnings (loss) per share: | | | | | | | | |
| Basic: | | | | | | | | |
| Continuing operations | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Discontinued operations | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| |
| Total basic earnings per share | $2.08 | $6.43 | $1.36 | ($1.59) | $1.63 | $0.55 | $1.93 | ($0.05) |
| |
| Diluted: | | | | | | | | |
| Continuing operations | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Discontinued operations | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Total diluted earnings per share | $2.05 | $6.43 | $1.36 | ($1.58) | $1.60 | $0.54 | $1.91 | ($0.05) |
| |
| Weighted-average shares outstanding: | | | | | | | | |