Other Employee Benefit Plans (Details)
 12 Months Ended
Oct. 31, 2012
Defined Contribution Pension Plan Canada [Member]
CAD
Oct. 31, 2011
Defined Contribution Pension Plan Canada [Member]
CAD
Oct. 31, 2012
Defined Contribution Profit Sharing Plan [Member]
USD ($)
Oct. 31, 2011
Defined Contribution Profit Sharing Plan [Member]
USD ($)
Oct. 31, 2010
Defined Contribution Profit Sharing Plan [Member]
USD ($)
Schedule of Defined Contribution Pension And Other Postretirement Plans Disclosure [Line Items]          
Maximum total employee and employer contribution percentage 18.00%        
Maximum total employee and employer contribution amount 23,820        
Required employer contribution percent 1.00%        
Employer matching percentage for eligible employee contribution 50.00%   50.00%    
Maximum employer annual contribution amount per employee 3,000        
Maximum employee contribution percentage of pre-tax compensation     60.00%    
Percentage of employee contribution with 50% employer matching contribution     6.00%    
Employer matching contributions 4,000,000 4,300,000 $ 4,100,000 $ 3,900,000 $ 3,400,000