Net Income Per Common Share - Net Income Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share, Basic [Abstract]
Net income	$ 23,056	$ 16,574	$ 75,161	$ 37,608
Less: Undistributed earnings allocated to participating securities	0	(1)	0	(34)
Net income attributable to common shares—basic	23,056	16,573	75,161	37,574
Weighted-average number of common shares used to compute basic net income per common share	46,824	43,992	46,138	43,128
Basic (in dollars per share)	$ 0.49	$ 0.38	$ 1.63	$ 0.87
Earnings Per Share, Diluted [Abstract]
Net income	23,056	16,574	75,161	37,608
Less: Undistributed earnings allocated to participating securities	0	(1)	0	(32)
Net income attributable to common shares—diluted	23,056	16,573	75,161	37,576
Dilutive effect of options to purchase common stock	$ 5,184	$ 3,432	$ 4,964	$ 2,729
Weighted-average number of common shares used to compute diluted net income per common share	52,008	47,424	51,102	45,857
Diluted net income per common share	$ 0.44	$ 0.35	$ 1.47	$ 0.82
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	175	2,142	627	3,892