| In millions, except per share items | Jun-30-23 | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Operating Revenues: | | | | | | | | |
| Electric utility revenues | 412.7 | 429.3 | 517.1 | 357.7 | 343.9 | 334.4 | 446.4 | 359.1 |
| Other | 1.1 | 0.3 | 0.9 | 1.1 | 0.4 | | 0.6 | 1.0 |
| Total operating revenues | 385.2 | 385.7 | 515.4 | 345.5 | 318.2 | 299.1 | 434.7 | 357.5 |
| Total operating revenues growth | 11.5% | 21.2% | 18.6% | -3.4% | 9.2% | -1.1% | 7.9% | 14.9% |
| Operating Expenses: | | | | | | | | |
| Purchased power | 91.5 | 171.1 | 192.9 | 91.7 | 85.4 | 91.8 | 137.8 | 96.1 |
| Fuel expense | 31.1 | 89.1 | 63.6 | 34.4 | 45.7 | 56.6 | 59.4 | 31.2 |
| Power cost adjustment | 49.6 | -51.3 | -30.8 | -0.4 | -0.4 | -24.9 | -22.7 | -7.9 |
| Other operations and maintenance | 97.1 | 92.0 | 100.7 | 100.6 | 92.1 | 99.4 | 87.7 | 88.5 |
| Energy efficiency programs | 6.6 | 5.2 | 8.3 | 6.6 | 6.6 | 7.3 | 6.9 | 6.7 |
| Depreciation | 47.1 | 45.4 | 46.0 | 34.8 | 44.5 | 44.5 | 44.1 | 43.6 |
| Other electric utility operating expenses | 7.8 | 9.0 | 8.8 | 8.9 | 8.9 | | 9.0 | 9.0 |
| Total electric utility operating expenses | 330.8 | 360.5 | 389.4 | 276.6 | 282.8 | | 322.2 | 267.2 |
| Other | 0.7 | 1.0 | 0.4 | 0.6 | 0.9 | 0.8 | 0.6 | 0.5 |
| Total operating expenses | 331.5 | 361.6 | 389.8 | 277.2 | 283.6 | 283.1 | 322.8 | 267.7 |
| Operating Income | 82.3 | 68.1 | 128.2 | 81.5 | 60.7 | 51.9 | 124.2 | 92.4 |
| Operating margin | 21.4% | 17.7% | 24.9% | 23.6% | 19.1% | 17.4% | 28.6% | 25.9% |
| |
| Nonoperating (Income) Expense: | | | | | | | | |
| Allowance for equity funds used during construction | -11.2 | -9.9 | -9.5 | -9.3 | -9.1 | -8.1 | -7.9 | -7.8 |
| Earnings of unconsolidated equity-method investments | -2.7 | -2.5 | -4.1 | -2.3 | -2.3 | -2.7 | -4.1 | -2.3 |
| Interest on long-term debt | 28.6 | 25.0 | 22.1 | 21.4 | 21.1 | 147.3 | 21.0 | 21.0 |
| Other interest | 4.6 | 4.8 | 4.2 | 3.9 | 3.8 | 3.8 | 3.7 | 3.6 |
| |
| Allowance for borrowed funds used during construction | | | | | | | | |
| Other income, net | -8.8 | -8.1 | -3.0 | -1.6 | -1.6 | 4.7 | -0.9 | -0.5 |
| Total nonoperating expense, net | -3.5 | -3.2 | 6.1 | 8.6 | 8.5 | 15.7 | 8.9 | 11.1 |
| Income Before Income Taxes | 77.0 | 63.1 | 122.1 | 72.9 | 52.2 | 36.2 | 115.3 | 81.3 |
| Income Tax Expense | 8.1 | 7.1 | 15.5 | 8.3 | 6.0 | 3.4 | 17.4 | 11.1 |
| Net Income | 68.9 | 56.0 | 106.6 | 64.6 | 46.2 | 32.8 | 98.0 | 70.3 |
| Income attributable to noncontrolling interests | -0.3 | 0.1 | -0.2 | -0.3 | 0.1 | 0.0 | -0.1 | -0.3 |
| Net Income Attributable to IDACORP, Inc. | 68.6 | 56.1 | 106.4 | 64.3 | 46.3 | 32.8 | 97.9 | 70.0 |
| |
| Weighted-average common shares outstanding - basic (in shares) | 50.7 | 50.7 | 50.7 | 50.7 | 50.6 | 50.6 | 50.6 | 50.6 |
| Weighted-average common shares outstanding - diluted (in shares) | 50.8 | 50.7 | 50.7 | 50.7 | 50.7 | 50.6 | 50.7 | 50.6 |
| |
| Earnings Per Share of Common Stock: | | | | | | | | |
| Earnings attributable to IDACORP, Inc. - basic (in dollars per share) | $1.35 | $1.11 | $2.10 | $1.27 | $0.91 | $0.64 | $1.93 | $1.38 |
| Earnings attributable to IDACORP, Inc. - diluted (in dollars per share) | $1.35 | $1.11 | $2.10 | $1.27 | $0.91 | $0.65 | $1.93 | $1.38 |