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Stock-Based Compensation (Details 2)
12 Months Ended
Jun. 30, 2015
$ / shares
shares
Jun. 30, 2014
$ / shares
Jun. 30, 2013
item
$ / shares
shares
Stock Awards      
Granted, shares | shares 20,000    
Number of tranches in which options were granted | item     3
Stock options with market-based conditions      
Stock Awards      
Granted, shares | shares     237,616
Number of executives to whom options were granted | item     3
Stock options with market-based conditions | First tranche | December 29, 2010 through December 29, 2015      
Stock Awards      
Applicable hurdle price (in dollar per share)     $ 27.86
Stock options with market-based conditions | First tranche | December 29, 2015 through December 29, 2016      
Stock Awards      
Applicable hurdle price (in dollar per share)     31.34
Stock options with market-based conditions | First tranche | December 29, 2016 through December 29, 2017      
Stock Awards      
Applicable hurdle price (in dollar per share)     34.83
Stock options with market-based conditions | First tranche | December 29, 2010 through December 28, 2015      
Stock Awards      
Amended hurdle price (in dollar per share)     16.43
Stock options with market-based conditions | First tranche | December 29, 2015 through December 28, 2016      
Stock Awards      
Amended hurdle price (in dollar per share)     18.58
Stock options with market-based conditions | First tranche | December 29, 2016 through December 28, 2017      
Stock Awards      
Amended hurdle price (in dollar per share)     20.77
Stock options with market-based conditions | Second tranche | December 29, 2016 through December 29, 2017      
Stock Awards      
Applicable hurdle price (in dollar per share)     34.83
Stock options with market-based conditions | Second tranche | December 29, 2010 through December 29, 2016      
Stock Awards      
Applicable hurdle price (in dollar per share)     31.34
Stock options with market-based conditions | Second tranche | December 29, 2016 through December 28, 2017      
Stock Awards      
Amended hurdle price (in dollar per share)     20.77
Stock options with market-based conditions | Second tranche | December 29, 2010 through December 28, 2016      
Stock Awards      
Amended hurdle price (in dollar per share)     18.58
Stock options with market-based conditions | Third tranche | December 29, 2010 through December 29, 2017      
Stock Awards      
Applicable hurdle price (in dollar per share)     34.83
Stock options with market-based conditions | Third tranche | December 29, 2010 through December 28, 2017      
Stock Awards      
Amended hurdle price (in dollar per share)     $ 20.77
Black-Scholes option-pricing model      
Assumptions:      
Dividend yield (as a percent) 0.43% 3.85%  
Expected life 7 years 7 years  
Expected volatility (as a percent) 30.30% 30.38%  
Risk-free interest rate (as a percent) 2.03% 2.14%  
Weighted average fair value per option (in dollar per share) $ 3.11 $ 1.95  
Hull-White option pricing model      
Assumptions:      
Dividend yield (as a percent) 3.72%    
Expected life 7 years 9 months 18 days    
Incremental weighted average fair value per option (in dollar per share) $ 0.52    
Stock Awards      
Expected volatility, minimum (as a percent) 28.45%    
Expected volatility, maximum (as a percent) 32.84%    
Risk-free interest rate, minimum (as a percent) 0.07%    
Risk-free interest rate, maximum (as a percent) 1.54%