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Fair Value Measurements (Tables)
9 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of fair value derivatives, assets and liabilities
As of
   
March 31, 2019
   
June 30, 2018
 
     
Level 1
   
Level 2
   
Level 1
   
Level 2
 
Short-term investments
      $ 49,000         $         $ 50,000         $    
Derivatives asset (liability)
      $         $ 308         $         $ 71    
Interest rate swap
      $         $ 1,537         $         $ 5,078