Corporate performance measurement period.

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Cumulative amount recorded in shareholders' equity.

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Grant date weighted average fair value per share.

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Normal retirement age of employees.

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

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

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- Definition

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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- Definition

Transfer restrictions lapse period for non employee directors.

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- Definition

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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-SubTopic 10
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- Definition

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

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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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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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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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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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- Definition

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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- Definition

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

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

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
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of common shares available for grant	2,900
Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expense related to director deferred compensation	$ 31	$ 26
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	$ 2,617	$ 2,322
Options exercisable beginning period	1 year
Unrecognized compensation cost related to unvested stock option	$ 15,201
Weighted average period expected to be amortized, non vested shares	1 year 7 months 6 days
Weighted-average expected volatility used	25.00%	29.10%
Weighted average grant date fair value of stock options granted	$ 31.42	$ 28.86
Total intrinsic value of options exercised	$ 18,723	$ 12,450
Cash received from the exercise of stock options	$ 10,306	8,246
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 [Member] \| 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 [Member] \| 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]
Normal retirement age	65 years
Weighted average period expected to be amortized, non vested shares	2 years 2 months 12 days
Period for restricted shares and share units considered to be forfeited for retirees	12 months
Unrecognized compensation cost related to nonvested restricted stock	$ 4,678
Expense related to nonvested common shares	754	578
Common share dividends amount included in compensation cost	$ 17	16
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	9 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	$ 751
Expense related to nonvested common shares	$ 253	253
Performance Share Incentive Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value	$ 123.45		$ 67.69
Compensation expense	$ 3,349	$ 252
Cumulative amount recorded in shareholders' equity related to Long-Term Incentive Plan	$ 10,471
Periods of performance considered for calculating compensation expense	3 years
Performance Share Incentive Awards [Member] \| November 28, 2016 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value		$ 104.49
Performance Share Incentive Awards [Member] \| November 21, 2016 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value		$ 103.75