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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Feb. 08, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Dividend rate	4.875%
Proceeds from issuance of preferred stock, net		$ 293,325	$ 0	$ 0
Stock repurchased (in shares)		10,810,113	3,339,530
Additional shares authorized to be repurchased (in shares)		3,817,118
Public Offering
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)	12,000,000
Public offering price (in usd per share)	$ 25.00
Percentage of preferred stock	2.50%
Public Offering | Series A Preferred Stock
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)	300,000
Weighted average
Class of Stock [Line Items]
Weighted average cost of repurchased stock (in dollars per share)		$ 32.25	$ 33.58

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