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Employee Benefit Plans (Other Retirement Plans) - Additional Information (Detail)
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12 Months Ended | ||||
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Oct. 31, 2012
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Oct. 31, 2012
Other Retirement Plans
USD ($)
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Oct. 31, 2012
Other Retirement Plans
CAD
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Oct. 31, 2011
Other Retirement Plans
USD ($)
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Oct. 31, 2010
Other Retirement Plans
USD ($)
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| 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 | |||