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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Jun. 30, 2010
Maximum [Member]
LTIP 3 [Member]
Jun. 30, 2011
Maximum [Member]
LTIP 4 [Member]
Jun. 30, 2010
Minimum [Member]
LTIP 3 [Member]
Jun. 30, 2011
Minimum [Member]
LTIP 4 [Member]
Jun. 30, 2011
Deferred Stock Units [Member]
Jun. 30, 2010
Deferred Stock Units [Member]
Oct. 29, 2010
Performance Stock Units [Member]
Jun. 30, 2010
Performance Stock Units [Member]
Jul. 21, 2009
Restricted Stock Awards [Member]
Jun. 30, 2009
LTIP 1 [Member]
Jun. 30, 2008
LTIP 1 [Member]
Jun. 30, 2011
LTIP 2 [Member]
Jun. 30, 2009
LTIP 2 [Member]
Jun. 30, 2010
LTIP 3 [Member]
Jun. 30, 2011
LTIP 4 [Member]
Jun. 30, 2010
LTIP 1 and LTIP 2 [Member]
Jun. 30, 2011
LTIP 3 and LTIP 4 [Member]
Preference shares issued 0 0                                    
Vesting period of stock options (in years) 4 four 4                                  
Minimum period (in years) for expiry of stock option 7 seven 7                                  
Maximum period (in years) for expiry of stock option 10 ten 10                                  
Purchase of treasury stock (in shares) 264,834 307,579 0                                  
Purchase of treasury stock $ 12,499,000 $ 14,000,000                                    
Unrecognized compensation cost relating to unvested stock awards 5,200,000                                      
Cash used to settle equity instruments granted under share-based compensation arrangements 0                                      
Awards Settled in cash in the aggregate amount                           14,400,000            
Unvested stock awards compensation cost, weighted average recognition period (years) 2                                      
Unvested stock awards compensation cost, weighted average recognition period (years) 0 0 0                                  
Cash proceeds from exercise of options granted 10,100,000 8,900,000 18,700,000                                  
Tax benefit realized from exercise of options 2,800,000 1,900,000 8,600,000                                  
Share-based payment awards granted               6,606 4,299 264,834 307,579 574,767                
Share-based payment awards granted, value                       $ 13.33                
LTIP equity plans, estimated award grant percentage against target       150.00% 150.00% 50.00% 50.00%                 100.00% 100.00% 100.00%    
Compensation cost expensed during the period-LTIP equity plans                         3,900,000   5,600,000   1,500,000   14,200,000 7,300,000
Compensation cost, liability outstanding                               $ 10,900,000     $ 15,400,000  
Common shares were available for issuance   1,331,045