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Stock Repurchase Program - Additional Information (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Sep. 05, 2018	Mar. 20, 2018	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, total cost			$ 5,300,000	$ 4,800,000
Common Stock [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount to repurchase issued and outstanding common stock	$ 50,000,000
Stock repurchase program, expiration date	Sep. 04, 2020	Mar. 19, 2020
Stock repurchase program, remaining authorized, amount			$ 41,300,000		$ 41,300,000
Stock repurchase program, number of remaining shares purchased			495,475	238,547	495,475
Stock repurchase program, total cost			$ 5,300,000		$ 5,300,000
Stock repurchase program, average price per share			$ 10.77		$ 10.77
Common Stock [Member] | Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount to repurchase issued and outstanding common stock		$ 50,000,000

X

- Definition

Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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Amount of stock repurchase plan authorized.

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- Definition

Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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