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Stockholders' Equity (Notes)
3 Months Ended
Dec. 31, 2021
Stockholders' 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 its at-the-market equity offering program that became effective in November 2021. In the three months ended December 31, 2021, the Company issued 84,547 shares of common stock under its at-the-market equity offering program for proceeds of $1.7 million, net of commissions and other issuance costs totaling $0.1 million. At December 31, 2021, $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.

There were no new grants of time-based RSUs in the three months ended December 31, 2021. Total stock-based compensation expense related to the Company's restricted stock units for the three months ended December 31, 2021 and 2020 was $0.4 million and $0.3 million, respectively.