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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions				3 Months Ended		6 Months Ended
	Apr. 22, 2020 item $ / shares shares	Jan. 02, 2020 director $ / shares shares	Dec. 18, 2019 $ / shares shares	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2020 USD ($) $ / shares shares	Apr. 30, 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
Stock-based compensation expense | $				$ 1.8	$ 0.9	$ 2.7	$ 1.8
Unrecognized stock based compensation expenses | $				3.4		$ 3.4
Forfeited, Number of Shares						14,000
Vested, Number of Shares						51,000
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		$ 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		0.5
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		$ 0.3
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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