Stock-based Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Stock-Based Compensation Activity [Line Items]
Unrecognized compensation costs, nonvested awards, amount	$ 14.9
Unrecognized compensation costs, nonvested awards, weighted average recognition period	2 years 4 months 24 days
Restricted Stock Awards [Member]
Stock-Based Compensation Activity [Line Items]
Units granted	102,000	99,000
Weighted average grant date fair value	$ 33.53	$ 36.05
Restricted Stock Unit Awards [Member]
Stock-Based Compensation Activity [Line Items]
Units granted	14,000	6,000
Weighted average grant date fair value	$ 32.49	$ 31.72
Employee Stock Purchase Plan [Member]
Stock-Based Compensation Activity [Line Items]
Shares issued	16,000	23,000

Stock-based compensation activity.

No definition available.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

Number of shares issued under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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