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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 $)
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Weighted-average fair value of options granted (in dollars per share) $ 19.39 $ 17.89 $ 14.26
Expected volatility 41.00% 40.00% 39.00%
Risk-free interest rate 0.69% 1.70% 2.20%
Expected dividend yield 0.00% 0.00% 0.00%
Expected life (in years) 4 years 7 months 13 days 4 years 3 months 18 days 4 years 3 months 18 days
Forfeiture rate (based on historical rates) 5.00% 5.00% 5.00%