Correction of Interim Consolidated Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Consolidated statements of operations
Provision (benefit) for income taxes	$ 6,148	$ 3,042	$ 3,887	$ 1,933	$ 6,929	$ 13,077	$ 7,936
Net income (loss)	$ 16,696	$ 14,248	$ 18,932	$ 6,370	$ 33,180	$ 49,876	$ 14,515
Net income (loss) per share - basic	$ 0.43	$ 0.37	$ 0.49	$ 0.21	$ 0.85	$ 1.28	$ 0.48
Net income (loss) per share - diluted	$ 0.42	$ 0.36	$ 0.48	$ 0.21	$ 0.84	$ 1.25	$ 0.48
As reported
Consolidated statements of operations
Provision (benefit) for income taxes	$ 3,419	$ 1,885	$ 2,338		$ 4,223	$ 7,642
Net income (loss)	$ 19,425	$ 15,405	$ 20,481		$ 35,886	$ 55,311
Net income (loss) per share - basic	$ 0.50	$ 0.40	$ 0.53		$ 0.92	$ 1.42
Net income (loss) per share - diluted	$ 0.49	$ 0.39	$ 0.52		$ 0.90	$ 1.39
Correction
Consolidated statements of operations
Provision (benefit) for income taxes	$ 2,729	$ 1,157	$ 1,549		$ 2,706	$ 5,435
Net income (loss)	$ (2,729)	$ (1,157)	$ (1,549)		$ (2,706)	$ (5,435)
Net income (loss) per share - basic	$ (0.07)	$ (0.03)	$ (0.04)		$ (0.07)	$ (0.14)
Net income (loss) per share - diluted	$ (0.07)	$ (0.03)	$ (0.04)		$ (0.07)	$ (0.14)