Marketable Securities	12 Months Ended
Sep. 30, 2022
Marketable Securities [Abstract]
Marketable Securities	16. Marketable Securities We did not hold any marketable securities as of September 30, 2022 or 2021. In December 2020, we sold all our marketable securities to partially fund the Arena acquisition, resulting in proceeds of $56.2 million. Neither gross realized gains nor gross realized losses related to the sale were material.

The entire disclosure for investments in certain debt and equity securities.

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-Topic 942
-SubTopic 320
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-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1403
-Paragraph (b)

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