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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended
	Jan. 06, 2017 USD ($) $ / shares shares	Dec. 19, 2016 $ / shares shares	Jan. 04, 2016 director $ / shares shares	Jan. 31, 2017 USD ($) $ / shares shares	Jan. 31, 2017 USD ($) $ / shares shares	Jan. 31, 2016 USD ($)	Apr. 30, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense | $					$ 1,827	$ 462
Chief Operating Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price of common stock at grant date | $ / shares	$ 58.05
Stock compensation expense | $	$ 700
Unvested portion of restricted stock forfeited	12,800
Granted	12,800
Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense | $					500
Vested, Number of Shares				13,040
Board of Director Members for January Two Thousand Seventeen Option Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of vested stock options				5 years
Market price of common stock at grant date | $ / shares				$ 56.65
Vesting period				5 years
Estimated fair market value of options | $				$ 200
Stock options total compensation cost, not yet recognized | $				$ 200	$ 200
Remaining service period for recognition of unrecognized compensation cost					60 months
Granted				10,000
Exercised, Weighted-Average Exercise Price | $ / shares				$ 56.65
Stock Options [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					1 year
Expiration period, after grant date					2 years
Stock Options [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					5 years
Expiration period, after grant date					5 years
2011 Management Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized under ESPP							1,500,000
Number of non-employee directors | director			12
2011 Management Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted per non-employee			1,750
Restricted stock closing price awarded | $ / shares					$ 57.62
Restricted shares granted			21,000		103,000
Recognized stock-based compensation expense | $					$ 1,800	$ 500
Vested, Number of Shares					69,000
2011 Management Incentive Plan [Member] | Restricted Stock [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price | $ / shares			$ 62.65
Recognized stock-based compensation expense | $					$ 100
2011 Management Incentive Plan [Member] | Restricted Stock [Member] | Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted		70,327
Stock price | $ / shares		$ 56.20
Recognized stock-based compensation expense | $					$ 100
Shares vesting schedule per year		.33
2011 Management Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted					10,000

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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