Other Employee Benefit Plans (Details)	12 Months Ended
	Oct. 31, 2011 Defined Contribution Pension Plan Canada [Member] CAD	Oct. 31, 2010 Defined Contribution Pension Plan Canada [Member] CAD	Oct. 31, 2011 Defined Contribution Profit Sharing Plan [Member] USD ($)	Oct. 31, 2010 Defined Contribution Profit Sharing Plan [Member] USD ($)	Oct. 31, 2009 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	22,970
Required employer contribution percent	1.00%
Maximum employee contribution percentage of pre-tax compensation			60.00%
Employer matching percentage for eligible employee contribution	50.00%		50.00%
Maximum employer annual contribution amount per employee	3,000
Percentage of employee contribution with 50% employer matching contribution			6.00%
Employer matching contributions	4,300,000	2,500,000	$ 3,900,000	$ 3,400,000	$ 3,200,000