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Net Income per Share - Antidilutive Stock Options (Details) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 56,500 1,450,100 56,500 1,450,100