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Shareholders' Equity - Additional information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	May 31, 2019
Stockholders Equity Note [Abstract]
Number of shares of common stock authorized for buyback (in shares)				10,000,000
Remaining number of shares authorized to be repurchased (in shares)		7,459,328
Treasury stock, shares, acquired (in shares)		0	550,853
Treasury stock, value, acquired, cost method	$ 31.4		$ 40.8

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 505
-SubTopic 10
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