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Summary of Significant Accounting Policies and New Accounting Standards (Tables)
 12 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]  
Schedule of Net Income per Share and Weighted Average Shares
 
For the Years Ended June 30
    
2017
    
2016
    
2015
  
Net income
       $ 64,615         $ 82,728         $ 60,280    
Weighted average number of shares–basic
         39,524           39,254           38,969    
Dilutive effect of stock options
         518           708           846    
Weighted average number of shares–diluted
         40,042           39,962           39,815    
Net income per share                                      
basic
       $ 1.63         $ 2.11         $ 1.55    
diluted
       $ 1.61         $ 2.07         $ 1.51