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Summary of Significant Accounting Policies - Net Income Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share, Basic [Abstract]                      
Net income $ 16,549 $ 16,574 $ 13,335 $ 7,699 $ 8,426 $ 7,040 $ 4,914 $ 899 $ 54,157 $ 21,279 $ 29,853
Less: Undistributed earnings allocated to participating securities                 (36) (106) (280)
Net income attributable to common shares-basic                 54,121 21,173 29,573
Weighted-average number of common shares used to compute basic net income per common share                 43,599 41,992 40,890
Basic net income per common share (in US dollars per share) $ 0.37 $ 0.38 $ 0.31 $ 0.18 $ 0.20 $ 0.17 $ 0.12 $ 0.02 $ 1.24 $ 0.50 $ 0.72
Earnings Per Share, Diluted [Abstract]                      
Less: Undistributed earnings allocated to participating securities                 (34) (101) (260)
Net income attributable to common shared-diluted                 54,123 21,178 29,593
Dilutive effect of options to purchase common stock                 $ 2,913 $ 1,915 $ 3,262
Weighted-average number of common shares used to compute diluted net income per common share                 46,512 43,907 44,152
Diluted net income per common share (in US dollars per share) $ 0.34 $ 0.35 $ 0.30 $ 0.17 $ 0.19 $ 0.16 $ 0.11 $ 0.02 $ 1.16 $ 0.48 $ 0.67
Stock Options [Member]
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Anti-dilutive outstanding stock options, shares                 3,465 6,241 3,252