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Share Capital, Option Plans And Share-Based Payments (Schedule Of Weighted-Average Fair Value Of Options And Weighted-Average Assumptions Used) (Details) (USD $)
3 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Share Capital, Option Plans And Share-Based Payments [Abstract]  
Weighted-average fair value of options granted$ 17.66 [1]
Expected volatility40.50% 
Risk-free interest rate0.80% 
Expected dividend yield0.00% 
Expected life (in years)4.34 
Forfeiture rate (based on historical rates)5.00% 
Options granted120,0000
[1]There were no options granted during the three months ended September 30, 2010.