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Stockholders' Equity - Share Repurchase Program (Details) - Common stock - shares
6 Months Ended
Dec. 31, 2019
Mar. 31, 2018
Share Repurchase Program    
Number of shares repurchased 266,874  
Number of available for additional shares repurchased 295,833  
Maximum    
Share Repurchase Program    
Number of repurchased shares authorized   1,000,000