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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended
	Nov. 02, 2020 director $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2020 USD ($)	Apr. 30, 2011 shares
Share-based Compensation
Common stock shares authorized under plan				1,500,000
Restricted Stock [Member]
Share-based Compensation
Restricted shares granted		28,000
Restricted stock closing price awarded (in dollars per share) | $ / shares		$ 67.97
Stock-based compensation expense | $		$ 0.9	$ 0.9
Unrecognized stock based compensation expenses | $		$ 4.6
Vested, Number of Shares		36,000
Restricted Stock [Member] | Non-employee directors [Member]
Share-based Compensation
Restricted shares granted	16,500
Restricted stock closing price awarded (in dollars per share) | $ / shares	$ 67.97
Stock-based compensation expense | $		$ 0.1
Number of non-employee directors | director	11
Restricted shares granted per non-employee	1,500
Restricted Stock [Member] | Executive officers [Member]
Share-based Compensation
Restricted shares granted	9,334
Restricted stock closing price awarded (in dollars per share) | $ / shares	$ 67.97
Stock-based compensation expense | $		$ 0.1
Annual incremental vesting percentage	50.00%
Restricted Stock [Member] | Key Employees [Member]
Share-based Compensation
Restricted shares granted	2,600
Restricted stock closing price awarded (in dollars per share) | $ / shares	$ 67.97
Annual incremental vesting percentage	33.00%
Stock Options [Member] | Minimum
Share-based Compensation
Vesting period		1 year
Expiration period, after grant date		2 years
Stock Options [Member] | Maximum
Share-based Compensation
Vesting period		5 years
Expiration period, after grant date		5 years

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