| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue | ||||||||||||||||
| Total revenue | ||||||||||||||||
| YoY growth | +10.8% | +12.3% | -14.2% | -13.2% | ||||||||||||
| Costs and expenses | ||||||||||||||||
| Costs and expenses | ||||||||||||||||
| Depreciation and amortization | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Total costs and expenses | ||||||||||||||||
| % of revenue | -88.8% | -108.0% | -101.9% | -100.6% | ||||||||||||
| Operating income (loss) | ||||||||||||||||
| % of revenue | 11.2% | -8.0% | -1.9% | -0.6% | ||||||||||||
| Interest expense, net | ||||||||||||||||
| Gain (loss) on sale of assets | — | — | ||||||||||||||
| Other income (expense) | ||||||||||||||||
| Income (loss) before income tax expense and equity earnings of unconsolidated joint ventures | ||||||||||||||||
| Equity earnings of unconsolidated joint ventures | ||||||||||||||||
| Income (loss) before income taxes | ||||||||||||||||
| Income tax benefit (expense) | ||||||||||||||||
| Net income (loss) | ||||||||||||||||
| % of revenue | 3.5% | -18.0% | -5.2% | -8.3% | ||||||||||||
| Less: net income (loss) attributable to noncontrolling interests | ||||||||||||||||
| Net income (loss) attributable to Reading International, Inc. | ||||||||||||||||
| % of revenue | 3.4% | -18.1% | -5.1% | -8.0% | ||||||||||||
| Basic earnings (loss) per share | ||||||||||||||||
| Diluted earnings (loss) per share |