Stockholders' Equity (Notes)

6 Months Ended

Mar. 31, 2023

Equity, Attributable to Parent [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

Stockholders' Equity and Stock-Based Compensation

Stockholders' Equity

The Company has an effective shelf registration statement, filed with the Securities and Exchange Commission in October 2021, registering $750 million of equity securities, of which $300 million was reserved for sales under the at-the-market equity offering program that became effective in November 2021. The Company issued no shares of common stock under its at-the-market equity offering program in the six months ended March 31, 2023. At March 31, 2023, $748.2 million remained available for issuance under the shelf registration statement, of which $298.2 million was reserved for sales under the at-the-market equity offering program.

Restricted Stock Units (RSUs)

The Company’s Stock Incentive Plan provides for the granting of stock options and restricted stock units to executive officers, other key employees and non-management directors. Restricted stock unit awards may be based on performance (performance-based) or on service over a requisite time period (time-based). RSU equity awards represent the contingent right to receive one share of the Company’s common stock per RSU if the vesting conditions and/or performance criteria are satisfied. The RSUs have no voting rights until vested.

In the three months ended March 31, 2023, a total of 512,545 time-based RSUs were granted. The weighted average grant date fair value of these equity awards was $14.76 per unit, and they vest annually in equal installments over periods of three to five years. Total stock-based compensation expense related to the Company's RSUs for the three and six months ended March 31, 2023 was $1.9 million and $2.5 million compared to $1.6 million and $2.0 million in the prior year periods. Stock-based compensation expense in both the three and six months ended March 31, 2023 included $1.3 million of expense recognized for employees that were retirement eligible on the date of grant compared to $1.2 million in both prior year periods.