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Stock Repurchase Program - Additional Information (Detail) - USD ($)		12 Months Ended
	Sep. 05, 2018	Oct. 31, 2018	Mar. 20, 2018
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, total cost		$ 53,300,000
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, number of remaining shares purchased		3,233,352
Stock repurchase program, total cost		$ 53,300,000
Stock repurchase program, average price per share		$ 16.47
Stock repurchase program, remaining authorized, amount		$ 46,700,000
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

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- 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
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Amount of stock repurchase plan authorized.

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

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-Topic 210
-SubTopic 10
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-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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