Summary of Significant Accounting Policies - Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share, Basic [Abstract]
Net income	$ 26,702	$ 23,056	$ 31,242	$ 20,863	$ 16,549	$ 16,574	$ 13,335	$ 7,699	$ 101,863	$ 54,157	$ 21,279
Less: Undistributed earnings allocated to participating securities									0	(36)	(106)
Net income attributable to common shares-basic									$ 101,863	$ 54,121	$ 21,173
Weighted-average number of common shares used to compute basic net income per common share									46,434	43,599	41,992
Basic net income per common share (in US dollars per share)	$ 0.56	$ 0.49	$ 0.68	$ 0.46	$ 0.37	$ 0.38	$ 0.31	$ 0.18	$ 2.19	$ 1.24	$ 0.50
Earnings Per Share, Diluted [Abstract]
Less: Undistributed earnings allocated to participating securities									$ 0	$ (34)	$ (101)
Net income attributable to common shared-diluted									101,863	54,123	21,178
Dilutive effect of options and restricted stock units to purchase common stock									$ 3,660	$ 2,913	$ 1,915
Weighted-average number of common shares used to compute diluted net income per common share									50,094	46,512	43,907
Diluted net income per common share (in US dollars per share)	$ 0.51	$ 0.44	$ 0.61	$ 0.42	$ 0.34	$ 0.35	$ 0.30	$ 0.17	$ 2.03	$ 1.16	$ 0.48
Employee Stock Options and Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive outstanding equity awards, shares									3,805	3,465	6,241