Basis of Presentation and Summary of Significant Accounting Policies - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Authorized amount repurchase of common stock						$ 50,000,000.0
Share repurchases	$ 3,327,000	$ 7,505,000	$ 3,327,000	$ 24,004,000	$ 34,600,000
Average price per share (in dollars per share)	$ 9.20			$ 10.89
Completed common stock repurchase (in shares)	362			2,200
Remaining authorized repurchase amount	$ 12,000,000		$ 12,000,000