Stockholders' Equity - Quantities and Average Prices of Shares Issued Under the ESPP (Details) - Employee Stock Purchase Plan - $ / shares	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued under the ESPP	80,417	44,172	63,503
Average price of shares issued	$ 28.18	$ 73.40	$ 20.66

Number of shares issued under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Period Type:	duration