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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Jan. 02, 2019 director $ / shares shares	Dec. 14, 2018 $ / shares shares	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) $ / shares shares	Jul. 31, 2018 USD ($)	Apr. 30, 2011 shares
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted					35,000
Restricted stock closing price awarded (in dollars per share) | $ / shares					$ 77.33
Recognized stock-based compensation expense | $			$ 0.9	$ 0.9	$ 2.7	$ 2.7
Unrecognized stock based compensation expenses | $			2.9		$ 2.9
Vested, Number of Shares					(51,000)
Restricted Stock [Member] | Non-employee directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of non-employee directors | director	12
Restricted shares granted per non-employee	1,750
Restricted shares granted	21,000
Restricted stock closing price awarded (in dollars per share) | $ / shares	$ 71.56
Recognized stock-based compensation expense | $			0.4		$ 0.9
Restricted Stock [Member] | Executive officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted		14,522
Restricted stock closing price awarded (in dollars per share) | $ / shares		$ 85.67
Recognized stock-based compensation expense | $			$ 0.1		$ 0.3
Annual incremental vesting percentage		33.00%
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
2011 Management Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized under plan							1,500,000

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