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Dividends and Share Repurchases (Details) - $ / shares		3 Months Ended		6 Months Ended
	Mar. 07, 2025	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Stockholders' Equity Note [Abstract]
Cash dividends per share (in dollars per share)	$ 0.27	$ 0.27	$ 0.26	$ 0.53	$ 0.51
Stock repurchased (in shares)		726,082		815,610
Average cost per share (in dollars per share)		$ 29.39		$ 30,350
Remaining shares authorized to be repurchased (in shares)		10,777,898		10,777,898
Preferred stock dividends declared (in dollars per share)		$ 12.1875
Depository dividends declared (in dollars per share)		$ 0.30468750

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

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- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

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- Definition

Number of shares remaining authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481549/505-30-45-1

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
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