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Shareholders' Equity - Additional Information (Detail) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Aug. 31, 2017
Equity [Abstract]
Shares approved to repurchase			2,000,000
Shares purchased	4,470,731	4,426,487
Aggregate purchase price	$ 75,256,000	$ 74,561,000
Remaining shares available for future purchases under share repurchase program, amount	$ 342,885

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Amount remaining of a stock repurchase plan authorized.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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