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Stockholders' Equity (Notes) | 9 Months Ended
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Jun. 30, 2020
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 (SEC) in September 2018 registering $500 million of equity securities. At June 30, 2020, $394.3 million remains available for issuance under the shelf registration statement. 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 and have no voting rights during the vesting period. During the nine months ended June 30, 2020, a total of 175,325 time-based RSUs were granted. The weighted average grant date fair value of these equity awards was $16.01 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 restricted stock units for the three and nine months ended June 30, 2020 was $0.3 million and $1.6 million, respectively, and the nine month period includes $0.5 million of expense recognized for employees that were retirement eligible on the date of grant. Total stock-based compensation expense for the three and nine months ended June 30, 2019 was $0.9 million and $1.1 million, respectively, and both periods include $0.6 million of expense recognized for employees that were retirement eligible on the date of grant.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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