Summary of Significant Accounting Policies - Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Basic and diluted income (loss) per share computation:
Net income (loss) attributable to common stockholders	$ 42,004	$ (5,883)	$ 24,501	$ 12,666	$ 36,121	$ 37,167
Weighted average common shares-basic	41,525,736		40,160,362		41,042,401	40,072,360
Basic net income (loss) per share (in dollars per share)	$ 1.01		$ 0.61		$ 0.88	$ 0.93
Effect of dilutive stock options and restricted stock awards (in shares)	437,663		942,063		1,371,427	1,608,701
Weighted average common shares-diluted	41,963,399		41,102,425		42,413,828	41,681,061
Diluted net income (loss) per share (in dollars per share)	$ 1.00		$ 0.60		$ 0.85	$ 0.89
Stock options and restricted stock
Basic and diluted income (loss) per share computation:
Anti-dilutive shares	5,193		372,016		102,536	284,792