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Stock and Other Compensation Plans | 12 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock and Other Compensation Plans | Stock and Other Compensation Plans Stock-Based Compensation Plans Total stock-based compensation cost was $33.2 million, $25.4 million, and $23.7 million for the fiscal years ended September 30, 2025, 2024, and 2023. Of this amount, $20.5 million, $14.7 million, and $13.5 million was capitalized. 1998 Long-Term Incentive Plan We have the 1998 Long-Term Incentive Plan (LTIP), which provides a comprehensive, long-term incentive compensation plan providing for discretionary awards of incentive stock options, non-qualified stock options, stock appreciation rights, bonus stock, time-lapse restricted stock, time-lapse restricted stock units, performance-based restricted stock units, and stock units to certain employees and non-employee directors of the Company and our subsidiaries. The objectives of this plan include attracting and retaining the best available personnel and providing for additional performance incentives by providing employees with the opportunity to acquire common stock. We are authorized to grant awards up to a maximum cumulative amount of 13.2 million shares of common stock under this plan subject to certain adjustment provisions. As of September 30, 2025, non-qualified stock options, bonus stock, time-lapse restricted stock, time-lapse restricted stock units, performance-based restricted stock units, and stock units had been issued under this plan, and 2.2 million shares are available for future issuance. Restricted Stock Units Award Grants As noted above, the LTIP provides for discretionary awards of restricted stock units to help attract, retain, and reward certain employees of Atmos Energy and its subsidiaries. Certain of these awards vest based upon the passage of time and other awards vest based upon the passage of time and the achievement of specified performance targets. The fair value of the awards granted is based on the market price of our stock at the date of grant. We estimate forfeitures using our historical forfeiture rate. The associated expense is recognized ratably over the vesting period. We use authorized and unissued shares to meet share requirements for the vesting of restricted stock units. Employees who are granted time-lapse restricted stock units under our LTIP have a nonforfeitable right to dividend equivalents that are paid at the same rate and at the same time at which they are paid on shares of stock without restrictions. Time-lapse restricted stock units contain only a service condition that the employee recipients render continuous services to the Company for a period of three years from the date of grant, except for accelerated vesting in the event of death, disability, change of control of the Company or termination without cause (with certain exceptions). There are no performance conditions required to be met for employees to be vested in time-lapse restricted stock units. Employees who are granted performance-based restricted stock units under our LTIP have a forfeitable right to dividend equivalents that accrue at the same rate at which they are paid on shares of stock without restrictions. Dividend equivalents on the performance-based restricted stock units are paid either in cash or in the form of shares upon the vesting of the award. Performance-based restricted stock units contain a service condition that the employee recipients render continuous services to the Company for a period of three years from the beginning of the applicable three-year performance period, except for accelerated vesting in the event of death, disability, change of control of the Company or termination without cause (with certain exceptions) and a performance condition based on a cumulative earnings per share target amount. The following summarizes information regarding the restricted stock units granted under the plan during the fiscal years ended September 30, 2025, 2024, and 2023:
| 2025 |  | 2024 |  | 2023
| Number of Restricted Units |  | Weighted Average Grant-Date Fair Value |  | Number of Restricted Units |  | Weighted Average Grant-Date Fair Value |  | Number of Restricted Units |  | Weighted Average Grant-Date Fair Value
Nonvested at beginning of year | 397,929 |  |  | $ | 113.78 |  |  | 389,957 |  |  | $ | 109.10 |  |  | 381,295 |  |  | $ | 105.69 |
Granted | 229,828 |  |  | 135.68 |  |  | 212,207 |  |  | 117.11 |  |  | 241,436 |  |  | 109.78 |
Vested | (215,806) |  |  | 111.75 |  |  | (201,834) |  |  | 108.56 |  |  | (220,929) |  |  | 104.05 |
Forfeited | (3,815) |  |  | 127.58 |  |  | (2,401) |  |  | 115.44 |  |  | (11,845) |  |  | 107.47 |
Nonvested at end of year | 408,136 |  |  | $ | 127.74 |  |  | 397,929 |  |  | $ | 113.78 |  |  | 389,957 |  |  | $ | 109.10 |
As of September 30, 2025, there was $21.6 million of total unrecognized compensation cost related to nonvested restricted stock units granted under the LTIP. That cost is expected to be recognized over a weighted average period of 1.3 years. The fair value of restricted stock vested during the fiscal years ended September 30, 2025, 2024, and 2023 was $24.0 million, $21.6 million, and $22.8 million. Other Plans Direct Stock Purchase Plan We maintain a Direct Stock Purchase Plan, open to all investors, which allows participants to have all or part of their cash dividends paid quarterly in additional shares of our common stock. The minimum initial investment required to join the plan is $1,250. Direct Stock Purchase Plan participants may purchase additional shares of our common stock as often as weekly with voluntary cash payments of at least $25, up to an annual maximum of $100,000. Equity Incentive and Deferred Compensation Plan for Non-Employee Directors We have an Equity Incentive and Deferred Compensation Plan for Non–Employee Directors, which provides non-employee directors of Atmos Energy with the opportunity to defer receipt, until retirement, of compensation for services rendered to the Company and invest deferred compensation into either a cash account or a stock account. Other Discretionary Compensation Plans We have an annual incentive program covering substantially all employees to give each employee an opportunity to share in our financial success based on the achievement of key performance measures considered critical to achieving business objectives for a given year with minimum and maximum thresholds. The Company must meet the minimum threshold for the plan to be funded and distributed to employees. These performance measures may include earnings growth objectives, improved cash flow objectives, or crucial customer satisfaction and safety results. We monitor progress towards the achievement of the performance measures throughout the year and record accruals based upon the expected payout using the best estimates available at the time the accrual is recorded. During the last several fiscal years, we have used earnings per share as our sole performance measure.

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