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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions						3 Months Ended		9 Months Ended
	Jun. 17, 2020 $ / shares shares	May 11, 2020 $ / shares shares	Apr. 22, 2020 item $ / shares shares	Jan. 02, 2020 director $ / shares shares	Dec. 18, 2019 $ / shares shares	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2020 USD ($) $ / shares shares	Jul. 31, 2019 USD ($)	Apr. 30, 2011 shares
Restricted Stock [Member]
Share-based Compensation
Restricted shares granted								67,000
Restricted stock closing price awarded (in dollars per share) | $ / shares								$ 83.01
Stock-based compensation expense | $							$ 0.9	$ 3.6	$ 2.7
Unrecognized stock based compensation expenses | $						$ 7.1		$ 7.1
Forfeited, Number of Shares								14,000
Vested, Number of Shares								51,000
Restricted Stock [Member] | Chief Financial Officer [Member]
Share-based Compensation
Restricted shares granted		5,418
Restricted stock closing price awarded (in dollars per share) | $ / shares		$ 55.37
Annual incremental vesting percentage		33.00%
Restricted Stock [Member] | Chief Financial Officer [Member] | Maximum [Member]
Share-based Compensation
Stock-based compensation expense | $						0.1		$ 0.1
Restricted Stock [Member] | Chief Executive Officer [Member]
Share-based Compensation
Restricted shares granted	13,053
Restricted stock closing price awarded (in dollars per share) | $ / shares	$ 76.61
Stock-based compensation expense | $								0.1
Annual incremental vesting percentage	33.00%
Restricted Stock [Member] | Former Officers [Member]
Share-based Compensation
Number of officers | item			3
Restricted shares granted			18,324
Restricted stock closing price awarded (in dollars per share) | $ / shares			$ 61.09
Stock-based compensation expense | $								1.1
Restricted Stock [Member] | Non-employee directors [Member]
Share-based Compensation
Restricted shares granted				18,000
Restricted stock closing price awarded (in dollars per share) | $ / shares				$ 87.21
Stock-based compensation expense | $						0.4		0.9
Number of non-employee directors | director				12
Restricted shares granted per non-employee				1,500
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
Stock-based compensation expense | $						$ 0.2		$ 0.5
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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