Net Income per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 16,574	$ 7,040	$ 37,608	$ 12,853
Less: undistributed earnings allocated to participating securities	(1)	(30)	(34)	(67)
Net income attributable to common shares - basic	16,573	7,010	37,574	12,786
Weighted-average number of common shares used to compute basic net income per common share	43,992	42,147	43,128	41,901
Basic net income per common share	$ 0.38	$ 0.17	$ 0.87	$ 0.31
Earnings Per Share, Diluted [Abstract]
Less: Undistributed earnings allocated to participating securities	(1)	(29)	(32)	(64)
Net income attributable to common shares - diluted	$ 16,573	$ 7,011	$ 37,576	$ 12,789
Dilutive effect of options to purchase common stock	3,432	2,001	2,729	2,020
Weighted-average number of common shares used to compute diluted net income per common share	47,424	44,148	45,857	43,921
Diluted net income per common share	$ 0.35	$ 0.16	$ 0.82	$ 0.29
Anti-dilutive outstanding stock options, shares	2,142	6,551	3,892	6,076