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Stock-Based Compensation - Additional information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Oct. 31, 2012 Y	Oct. 31, 2011	Oct. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options fully vested	2 years
Expiry of options	10
Granted, Shares
Share based compensation expense	$ 3.6	$ 4.2	$ 8.1
2005 Outside Directors Equity Award Plan Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	0.7	0.7	0.7
Shares of restricted stock	14,152	11,144
Weighted average grant date fair value	$ 50.87	$ 64.59
Long Term Incentive Plan Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	2.2	2.5	7.4
Shares of restricted stock	53,533	40,215
Weighted average grant date fair value	$ 41.44	$ 60.46
Chief Financial Officer [Member] | Common Stock Class A 2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares		30,000
Shares vested		15,000
Equal installments of remaining shares		7,500
Share based compensation expense	$ 0.7	$ 1.0
2001 Management Equity Incentive and Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted under various plans	5,000,000
Non-statutory Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted under various plans	400,000
Incentive Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted under various plans	2,000,000
Outside Directors Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted under various plans	200,000

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Net number of share options (or share units) granted during the period.

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