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Stock Incentive Plans - Status and changes of shares of long term incentive plans shares (Details) - LTIP - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Number of Shares      
Beginning balance, nonvested (in shares) 734,744    
Granted (in shares) 191,986    
Vested (in shares) (256,071)    
Canceled (in shares) (12,388)    
Ending balance, nonvested (in shares) 658,271 734,744  
Weighted-Average Grant Date Fair Value      
Beginning balance, nonvested (in USD per share) $ 119.56    
Granted (in USD per share) 206.99    
Vested (in USD per share) 122.11    
Canceled (in USD per share) 128.63    
Ending balance, nonvested (in USD per share) $ 143.90 $ 119.56  
LTIP - Additional Disclosures      
Stock-based compensation expense $ 65,640 $ 27,219 $ 21,150
Tax benefit (cost) $ 3,893 $ 1,701 $ 3,119
Shares surrendered upon exercise of stock 139,918 113,074 78,173