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Summary of Significant Accounting Policies and New Accounting Standards (Tables)
12 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Schedule of net income per share and weighted average shares
For the Year Ended June 30
   
2018
   
2017
   
2016
 
Net income
      $ 64,883         $ 64,615         $ 82,728    
Weighted average number of shares–basic
        40,181           39,524           39,254    
Dilutive effect of stock options and restricted stock units
        204           518           708    
Weighted average number of shares–diluted
        40,385           40,042           39,962    
Net income per share                                      
basic
      $ 1.61         $ 1.63         $ 2.11    
diluted
      $ 1.61         $ 1.61         $ 2.07