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Share Capital, Option Plans And Share-Based Payments (Summary Of Stock Options Outstanding) (Details) (USD $)
 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Number of options outstanding (in shares) 2,147,151 2,277,733 2,669,142
Weighted average remaining contractual life 4 years 4 months 2 days 2 years 9 months  
Weighted average exercise price, options outstanding (in dollars per share) $ 40.07 $ 24.51 $ 23.55
Number of options exercisable (in shares) 960,151 1,701,308  
Weighted average exercise price, options exercisable (in dollars per share) $ 25.92 $ 19.80  
$13.10 - $14.94 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 13.10    
Exercise price range, upper limit (in dollars per share) $ 14.94    
Number of options outstanding (in shares) 274,500    
Weighted average remaining contractual life 10 months 10 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 13.97    
Number of options exercisable (in shares) 274,500    
Weighted average exercise price, options exercisable (in dollars per share) $ 13.97    
$14.95 - $27.70 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 14.95    
Exercise price range, upper limit (in dollars per share) $ 27.70    
Number of options outstanding (in shares) 302,395    
Weighted average remaining contractual life 2 years 3 months 16 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 22.68    
Number of options exercisable (in shares) 302,395    
Weighted average exercise price, options exercisable (in dollars per share) $ 22.68    
$27.71 - $34.75 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 27.71    
Exercise price range, upper limit (in dollars per share) $ 34.75    
Number of options outstanding (in shares) 315,831    
Weighted average remaining contractual life 2 years 9 months 16 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 32.73    
Number of options exercisable (in shares) 233,581    
Weighted average exercise price, options exercisable (in dollars per share) $ 32.86    
$34.76 - $43.51 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 34.76    
Exercise price range, upper limit (in dollars per share) $ 43.51    
Number of options outstanding (in shares) 266,175    
Weighted average remaining contractual life 4 years 3 months 24 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 40.85    
Number of options exercisable (in shares) 109,925    
Weighted average exercise price, options exercisable (in dollars per share) $ 41.05    
$43.52 - $52.15 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 43.52    
Exercise price range, upper limit (in dollars per share) $ 52.15    
Number of options outstanding (in shares) 305,500    
Weighted average remaining contractual life 6 years 13 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 48.63    
Number of options exercisable (in shares) 30,500    
Weighted average exercise price, options exercisable (in dollars per share) $ 48.39    
$52.16 - $56.25 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 52.16    
Exercise price range, upper limit (in dollars per share) $ 56.25    
Number of options outstanding (in shares) 256,500    
Weighted average remaining contractual life 6 years 8 months 6 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 52.82    
Number of options exercisable (in shares) 6,750    
Weighted average exercise price, options exercisable (in dollars per share) $ 56.25    
$56.26 - $61.63 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 56.26    
Exercise price range, upper limit (in dollars per share) $ 61.63    
Number of options outstanding (in shares) 426,250    
Weighted average remaining contractual life 6 years 6 months 24 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 60.37    
Number of options exercisable (in shares) 2,500    
Weighted average exercise price, options exercisable (in dollars per share) $ 61.63    
$13.10 - $61.63 [Member]
      
Exercise price range, lower limit (in dollars per share) $ 13.10    
Exercise price range, upper limit (in dollars per share) $ 61.63    
Number of options outstanding (in shares) 2,147,151    
Weighted average remaining contractual life 4 years 4 months 2 days    
Weighted average exercise price, options outstanding (in dollars per share) $ 40.07    
Number of options exercisable (in shares) 960,151    
Weighted average exercise price, options exercisable (in dollars per share) $ 25.92