Corporate performance measurement period.

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- Definition

Cumulative amount recorded in shareholders' equity.

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- Definition

Deferred compensation arrangement with individual employee contribution percentage maximum.

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- Definition

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

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- Definition

Grant date weighted average fair value.

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- Definition

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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No definition available.

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- Definition

Share based compensation share based award options forfeiture period for retirees.

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No definition available.

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- Definition

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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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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-Section F

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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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No definition available.

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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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-Publisher FASB

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-Paragraph 2

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- Definition

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.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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- Definition

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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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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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

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

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

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- Definition

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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- Definition

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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-Name Accounting Standards Codification

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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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-Name Accounting Standards Codification

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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 $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 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	$ 25	$ 47	$ 52
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	2,103	2,178	4,571	5,844
Options exercisable beginning period			1 year
Unrecognized compensation cost related to nonvested stock option	9,556		9,556
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	5,082	2,307	6,179	5,961
Cash received from the exercise of stock options			3,174	3,499
Tax benefit realized from tax deductions from exercises of stock options			1,814	1,795
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 Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period expected to be amortized, non vested shares			2 years
Period for restricted shares and share units considered to be forfeited for retirees			12 months
Period for pro-rata vesting of shares or units for non-employee directors			1 year
Unrecognized compensation cost related to nonvested restricted stock	2,857		2,857
Expense related to nonvested common shares	464	424	936	895
Common share dividends amount included in compensation cost	12	12	25	25
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			6 months
Unrecognized compensation cost related to nonvested restricted stock	480		480
Expense related to nonvested common shares	243	223	486	445
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 charged	1,242	1,303	2,491	2,445
Cumulative amount recorded in shareholders' equity related to Long-Term Incentive Plan	6,593		6,593
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	$ 84	$ 58
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%