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Basis of Presentation and Summary of Significant Accounting Policies - Share Repurchase Program (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Authorized amount repurchase of common stock							$ 50,000,000.0
Share repurchases		$ 3,327,000		$ 3,327,000	$ 3,300,000	$ 34,600,000
Completed common stock repurchase (in shares)	0		0
Remaining authorized repurchase amount	$ 12,000,000.0		$ 12,000,000.0

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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