Employee Benefit Plans (Other Retirement Plans) - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2012 Other Retirement Plans USD ($)	Oct. 31, 2012 Other Retirement Plans CAD	Oct. 31, 2011 Other Retirement Plans USD ($)	Oct. 31, 2010 Other Retirement Plans USD ($)
Other Retirement Plans [Line Items]
Deferred percentage of annual cash base compensation	50.00%
Deferred percentage of variable cash compensation	100.00%
Employer contribution		$ 23,200,000		$ 21,400,000	$ 14,700,000
Pretax employee matching contributions		$ 1,500	4,000