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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 27, 2012
Jun. 30, 2012
Sep. 30, 2012
Stock Options [Member]
Sep. 30, 2011
Stock Options [Member]
Sep. 30, 2012
Deferred Stock Units [Member]
Sep. 30, 2011
Deferred Stock Units [Member]
Jul. 21, 2009
Restricted Stock Awards [Member]
Sep. 30, 2012
Employee Share Purchase Plan [Member]
Sep. 30, 2011
Employee Share Purchase Plan [Member]
Sep. 30, 2007
LTIP [Member]
Sep. 30, 2012
Fiscal 2010, 2011 and 2012 LTIP [Member]
Sep. 30, 2011
Fiscal 2010, 2011 and 2012 LTIP [Member]
Jun. 30, 2010
Fiscal 2010 LTIP [Member]
Jun. 30, 2011
Fiscal 2011 LTIP [Member]
Jun. 30, 2011
Maximum [Member]
Fiscal 2011 LTIP [Member]
Sep. 30, 2012
Maximum [Member]
Fiscal 2012 LTIP [Member]
Jun. 30, 2011
Minimum [Member]
Fiscal 2011 LTIP [Member]
Sep. 30, 2012
Minimum [Member]
Fiscal 2012 LTIP [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]                                        
Common shares reissued (in shares) 0     0                                
Number of additional shares autorized for issuance (in shares)     2,500,000                                  
Number of options outstanding (in shares) 2,011,176     2,147,151 2,011,176                              
Common shares available for issuance (in shares)         2,971,170                              
Vesting period         4 years 4 years                            
Expire period of options, minimum term         7 years 7 years                            
Expire period of options, maximum term         10 years 10 years                            
Unrecognized compensation cost relating to unvested stock awards $ 16.3                                      
Unvested stock awards compensation cost, weighted average recognition period (in years) 3 years                                      
Cash proceeds from exercise of options granted 3.4 7.2                                    
Tax benefit realized from exercise of options 0.8 0.4                                    
Plan term (in years)                       3 years                
Average stock price of common stock, average period                       30 days                
LTIP equity plans, actual award grant percentage                             150.00%          
LTIP equity plans, estimated award grant percentage against target                               100.00% 150.00% 150.00% 50.00% 0.00%
Compensation cost expensed during the period-LTIP equity plans                         1.4 4.0            
Amount granted (in shares)             299 263 574,767                      
Restricted stock awards granted, value (in dollars per share)                 $ 13.33                      
Cash received from employee stock purchase plan                   $ 0.6 $ 0.6