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Stock Option and Incentive Plan - Assumptions Used in Calculating Fair Value of Options (Parenthetical) (Detail) shares in Thousands	12 Months Ended
	Sep. 30, 2022 shares
Disclosure of Stock Option and Incentive Plan [Abstract]
Stock options granted	0

X

- References

No definition available.

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X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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