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Share Capital, Option Plans And Share-Based Payments (Summary Of Outstanding Stock Options) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Mar. 31, 2012
Y
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options outstanding beginning balance (in shares) 2,277,733
Options granted (in shares) 562,000
Options exercised to date (in shares) (811,931)
Options forfeited or expired (in shares) (25,026)
Options outstanding ending balance (in shares) 2,002,776
Options exercisable (in shares) 1,122,651
Options outstanding beginning balance, weighted-average exercise price (in dollars per share) $ 24.51
Options granted, weighted-average exercise price (in dollars per share) $ 58.28
Options exercised, weighted-average exercise price (in dollars per share) $ 20.63
Options forfeited or expired, weighted-average exercise price (in dollars per share) $ 39.23
Options outstanding ending balance, weighted-average exercise price (in dollars per share) $ 35.37
Options exercisable, weighted-average exercise price (in dollars per share) $ 22.73
Options outstanding, weighted-average remaining contractual term (in years) 3.77
Options exercisable, weighted-average remaining contractual term (in years) 2.22
Options outstanding, aggregate intrinsic value $ 51,650
Options exercisable, aggregate intrinsic value $ 43,141