Basis of Presentation and Summary of Significant Accounting Policies - Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Accelerated Share Repurchases [Line Items]
Authorized amount repurchase of common stock			$ 50,000
Share repurchases	$ 10,620	$ 34,624
Remaining authorized repurchase amount	15,400	15,400
Accelerated Share Repurchase Agreement
Accelerated Share Repurchases [Line Items]
Share repurchases	$ 600	$ 8,100
Completed common stock repurchase (in shares)	0.1	0.7
Average price per share (in dollars per share)	$ 9.54	$ 11.35