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, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Basic and diluted income (loss) per share computation:
Net income (loss) attributable to common stockholders	$ 24,501	$ 12,666	$ 20,594	$ (9,730)	$ 37,167	$ 10,864
Weighted average common shares-basic	40,160,362		39,450,017		40,072,360	39,369,287
Basic net income (loss) per share (in dollars per share)	$ 0.61		$ 0.52		$ 0.93	$ 0.28
Effect of dilutive stock options and restricted stock awards (in shares)	942,063		523,916		1,608,701	1,323,535
Weighted average common shares-diluted	41,102,425		39,973,933		41,681,061	40,692,822
Diluted net income (loss) per share (in dollars per share)	$ 0.60		$ 0.52		$ 0.89	$ 0.27
Additional disclosures
Common stock, shares issued	46,893,934				46,893,934		46,341,627
Common stock, shares outstanding	41,559,191				41,559,191		41,006,884
Stock options and restricted stock
Basic and diluted income (loss) per share computation:
Anti-dilutive shares	372,016		1,015,949		284,792	797,292