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Summary of Significant Accounting Policies - Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]        
Shares issuable under stock options 107,936 0 127,806 142,391
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 59,854 557,818 35,253 6,166