Net Income Per Common Share - Net Income Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic [Abstract]
Net income	$ 31,242	$ 13,335	$ 52,105	$ 21,034
Less: Undistributed earnings allocated to participating securities	0	(1)	0	(28)
Net income attributable to common shares—basic	31,242	13,334	52,105	21,006
Weighted-average number of common shares used to compute basic net income per common share	46,131	42,915	45,802	42,706
Basic (in dollars per share)	$ 0.68	$ 0.31	$ 1.14	$ 0.49
Earnings Per Share, Diluted [Abstract]
Net income	31,242	13,335	52,105	21,034
Less: Undistributed earnings allocated to participating securities	0	(1)	0	(26)
Net income attributable to common shares—diluted	31,242	13,334	52,105	21,008
Dilutive effect of options to purchase common stock	$ 4,960	$ 2,124	$ 4,765	$ 2,346
Weighted-average number of common shares used to compute diluted net income per common share	51,091	45,039	50,567	45,052
Diluted net income per common share	$ 0.61	$ 0.30	$ 1.03	$ 0.47
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive outstanding stock options, shares	707	6,288	470	5,461