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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)
3 Months Ended12 Months Ended3 Months Ended0 Months Ended12 Months Ended12 Months Ended3 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Maximum [Member]
LTIP 3 [Member]
Jun. 30, 2011
Maximum [Member]
LTIP 4 [Member]
Jun. 30, 2010
Minimum [Member]
LTIP 3 [Member]
Jun. 30, 2011
Minimum [Member]
LTIP 4 [Member]
Sep. 30, 2011
Deferred Stock Units [Member]
Jul. 21, 2009
Restricted Stock Awards [Member]
Sep. 30, 2010
LTIP 1 [Member]
Jun. 30, 2009
LTIP 2 [Member]
Sep. 30, 2011
LTIP 2 [Member]
Jun. 30, 2010
LTIP 3 [Member]
Jun. 30, 2011
LTIP 4 [Member]
Sep. 30, 2011
LTIP 3 And LTIP 4 [Member]
Sep. 30, 2010
LTIP 3 And LTIP 4 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Preference shares issued0               
Common shares reissued0 0             
Vesting period of stock options (in years)four               
Minimum period (in years) for expiry of stock optionseven               
Maximum period (in years) for expiry of stock optionten               
Purchase of treasury stock (in shares)00              
Cash used to settle equity instruments granted under share-based compensation arrangements$ 0               
Awards settled in cash in the aggregate amount         14,400,000 10,700,000    
Cash proceeds from exercise of options granted7,200,0002,900,000              
Tax benefit realized from exercise of options400,000900,000              
Share-based payment awards granted       263574,767       
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              4,000,0001,500,000
Number of options outstanding1,922,052 2,277,733             
Common shares were available for issuance1,211,045               
Unrecognized compensation cost relating to unvested stock awards$ 6,200,000               
Unvested stock awards compensation cost, weighted average recognition period (years)2