| 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 |
| | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Revenues | 129.1 | 363.3 | 608.9 | 398.4 | 442.8 | | 487.2 | 292.2 |
| Revenues growth | -70.8% | | 25.0% | 36.4% | 76.0% | | 192.8% | 72.1% |
| Direct operating expenses | -82.7 | -210.1 | -349.0 | -253.9 | 284.8 | | -296.3 | -165.8 |
| Selling, general and administrative expenses | 109.7 | 179.9 | 182.4 | 164.4 | 187.1 | | 162.3 | 174.8 |
| Depreciation and amortization | 9.0 | 23.0 | 29.1 | 29.8 | 36.0 | | 30.5 | 29.4 |
| Impairment and other gains, net | 3.1 | | | | | | | |
| Restructuring charges | 1.2 | 20.5 | 13.7 | | | | | |
| Operating (loss) income | -70.3 | -70.3 | 74.0 | -44.8 | -56.8 | | 35.4 | -83.3 |
| Operating margin | -54.5% | -19.3% | 12.1% | -11.3% | -12.8% | | 7.3% | -28.5% |
| Interest income | 2.2 | 2.6 | 3.6 | 4.0 | 1.9 | | 0.8 | 0.8 |
| Interest expense | | | 0.9 | 2.2 | 3.9 | | 8.2 | 9.2 |
| Other income (expense), net | | 5.0 | -3.9 | 1.5 | -21.4 | | -18.9 | -3.8 |
| Income (loss) from operations before income taxes | | -62.6 | 72.8 | -41.5 | -116.5 | | 9.1 | -95.6 |
| Income tax (expense) benefit | 115.1 | -8.6 | 2.2 | 2.5 | -17.3 | | 4.1 | -18.9 |
| Net income (loss) | | -54.0 | 70.6 | -44.0 | -99.2 | | 5.0 | -76.7 |
| |
| Less: Net income (loss) attributable to redeemable noncontrolling interests from discontinued operations | | | | | | | | |
| Less: Net loss attributable to nonredeemable noncontrolling interests from discontinued operations | | | | | | | | |
| Net income (loss) attributable to Sphere Entertainment Co.’s stockholders | 537.7 | | 67.6 | -44.8 | -99.9 | | 2.3 | -79.2 |
| |
| Basic earnings (loss) per common share | | | | | | | | |
| Continuing operations, basic (in dollars per share) | 0.0 | | | | 0.0 | | | |
| |
| Basic loss per common share attributable to Sphere Entertainment Co.'s stockholders | $15.43 | ($1.55) | $1.95 | ($1.30) | ($3.01) | | $0.07 | ($2.32) |
| |
| Diluted earnings (loss) per common share | | | | | | | | |
| Diluted loss per common share attributable to Sphere Entertainment Co.'s stockholders | $15.24 | ($1.55) | $1.95 | ($1.30) | ($3.01) | | $0.07 | ($2.32) |
| |
| Weighted-average number of common shares outstanding: | | | | | | | | |
| Basic (in shares) | 34.8 | 34.8 | 34.7 | 34.4 | 34.3 | | 34.3 | 34.1 |
| Diluted (in shares) | 35.2 | 34.8 | 34.7 | 34.4 | 34.3 | | 34.4 | 34.1 |