Corporate performance measurement period.

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Cumulative amount recorded in shareholders' equity.

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Deferred compensation arrangement with individual employee contribution percentage maximum.

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Deferred compensation arrangement with individual employee contribution percentage of long term incentive compensation maximum.

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Grant date weighted average fair value.

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Normal retirement age of employees.

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- Definition

Share based compensation arrangement by share based payment award exercisable period.

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- Definition

Share based compensation arrangement by share based payment award restriction period.

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Represents the credit to 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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Share based compensation share based award options forfeiture period for retirees.

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Share based compensation share based award restricted shares forfeiture period for retirees.

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Transfer restrictions lapse period for non employee directors.

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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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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Weighted average expected volatility rate of share-based compensation awards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of common shares available for grant	2,900		2,900
Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum			100.00%
Executive officers share-based long-term incentive compensation deferrals percentage, maximum			90.00%
Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense related to director deferred compensation	$ 22	$ 23	$ 69	$ 75
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum rate of stock option, description			Not exceeding 25 percent per year
Option expiring period			10 years
Compensation expense recognized	2,088	2,358	$ 6,659	$ 8,202
Options exercisable beginning period			1 year
Unrecognized compensation cost related to nonvested stock option	7,180		$ 7,180
Weighted average period expected to be amortized, non vested shares			1 year 4 months 24 days
Weighted-average expected volatility used			34.30%	44.50%
Weighted average grant date fair value of stock options granted			$ 24.63	$ 27.92
Total intrinsic value of options exercised	2,554	7,330	$ 8,733	$ 13,291
Cash received from the exercise of stock options			4,673	5,870
Tax benefit realized from tax deductions from exercises of stock options			$ 2,538	4,127
Stock Options [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum rate of stock option			25.00%
Stock Options [Member] \| Post November 2012 Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Normal retirement age			65 years
Period for options considered to be forfeited for retirees			12 months
Restricted Shares And Restricted Share Units \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant restricted shares transferred period			3 years
Restricted Shares And Restricted Share Units \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant restricted shares transferred period			1 year
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period expected to be amortized, non vested shares			1 year 10 months 24 days
Period for restricted shares and share units considered to be forfeited for retirees			12 months
Unrecognized compensation cost related to nonvested restricted stock	2,454		$ 2,454
Expense related to nonvested common shares	465	458	1,401	1,353
Common share dividends amount included in compensation cost	13	12	$ 38	37
Restricted Stock Unit [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period expected to be amortized, non vested shares			3 months 18 days
Period for pro-rata vesting of shares or units for non-employee directors			1 year
Unrecognized compensation cost related to nonvested restricted stock	240		$ 240
Expense related to nonvested common shares	243	222	$ 729	$ 667
Performance Share Incentive Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value			$ 76.48	$ 69.25	$ 59.59
Compensation expense		699	$ 2,424	$ 3,144
Share based compensation credit to expense recovery	67
Cumulative amount recorded in shareholders' equity related to Long-Term Incentive Plan	6,526		$ 6,526
Periods of performance considered for calculating compensation expense			3 years
Deferred Compensation [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common share dividends amount included in compensation cost	$ 45	$ 32	$ 129	$ 90
Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum			100.00%
Executive officers share-based long-term incentive compensation deferrals percentage, maximum			90.00%