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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended
	Jan. 02, 2020 director $ / shares shares	Dec. 18, 2019 $ / shares shares	Jan. 31, 2020 USD ($) $ / shares shares	Jan. 31, 2019 USD ($)	Apr. 30, 2011 shares
Restricted Stock [Member]
Share-based Compensation
Restricted shares granted			49,000
Restricted stock closing price awarded (in dollars per share) | $ / shares			$ 87.48
Recognized stock-based compensation expense | $			$ 0.9	$ 1.0
Unrecognized stock based compensation expenses | $			$ 4.1
Vested, Number of Shares			51,000
Restricted Stock [Member] | Non-employee directors [Member]
Share-based Compensation
Number of non-employee directors | director	12
Restricted shares granted per non-employee	1,500
Restricted shares granted	18,000
Restricted stock closing price awarded (in dollars per share) | $ / shares	$ 87.21
Recognized stock-based compensation expense | $			$ 0.1
Restricted Stock [Member] | Executive officers [Member]
Share-based Compensation
Restricted shares granted		31,158
Restricted stock closing price awarded (in dollars per share) | $ / shares		$ 87.63
Recognized stock-based compensation expense | $			$ 0.2
Annual incremental vesting percentage		33.00%
Stock Options [Member] | Minimum [Member]
Share-based Compensation
Vesting period			1 year
Expiration period, after grant date			2 years
Stock Options [Member] | Maximum [Member]
Share-based Compensation
Vesting period			5 years
Expiration period, after grant date			5 years
2011 Management Incentive Plan [Member]
Share-based Compensation
Common stock shares authorized under plan					1,500,000

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