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Stockholders' Equity (Notes)	6 Months Ended
	Mar. 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 (SEC) in September 2018 registering $500 million of equity securities, of which $100 million is reserved for sales under its at-the-market equity offering program that became effective in August 2020. During the three months ended March 31, 2021, the Company issued 1.0 million shares of common stock under its at-the-market equity offering program for proceeds of $23.3 million, net of commissions and other issuance costs. At March 31, 2021, $370.6 million remained available for issuance under the shelf registration statement, of which $76.3 million is reserved for sales under the Company's 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. During the six months ended March 31, 2021, a total of 232,320 time-based RSUs were granted. The weighted average grant date fair value of these equity awards was $23.12 per unit, and they vest annually in equal installments over a period of three to five years. Total stock-based compensation expense related to the Company's restricted stock units for the three and six months ended March 31, 2021 was $0.9 million and $1.2 million compared to $0.8 million and $1.3 million in the prior year periods. Stock-based compensation expense related to employees that were retirement eligible on the date of grant in the six months ended March 31, 2021 and 2020 was $0.7 million and $0.5 million, respectively.

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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

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