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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands					3 Months Ended			6 Months Ended
	Jan. 25, 2018 $ / shares shares	Jan. 02, 2018 director $ / shares shares	Dec. 18, 2017 $ / shares shares	Feb. 02, 2017 shares	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Apr. 30, 2017 USD ($)	Apr. 30, 2018 USD ($) $ / shares shares	Apr. 30, 2017 USD ($)	Oct. 31, 2017 USD ($)	Apr. 30, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense								$ 2,774	$ 2,658
Non-employee directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price of common stock at grant date | $ / shares	$ 87.10
Stock compensation expense						$ 800
Granted | shares	10,788
Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense								$ 100
Granted | shares				867
Stock Options [Member] | Minimum [Member]
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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period								5 years
Expiration period, after grant date								5 years
2005 Stock Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, Weighted-Average Exercise Price | $ / shares								$ 17.66
2011 Management Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized under ESPP | shares											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 | shares		1,750
Restricted stock closing price awarded | $ / shares								$ 80.20
Restricted shares granted | shares		21,000						47,000
Recognized stock-based compensation expense					$ 900		$ 800	$ 1,800	$ 1,500
Unrecognized stock based compensation expenses					4,800			4,800		$ 3,000
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		$ 85.90
Recognized stock-based compensation expense					500			600
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 | shares			25,241
Stock price | $ / shares			$ 75.45
Recognized stock-based compensation expense					$ 200			$ 300
Shares vesting schedule per year			.33

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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) per non-employee.

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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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Unrecognized cost of unvested share-based compensation awards.

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

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