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Shareholders' Equity - Additional Information (Detail) - USD ($) | Sep. 30, 2017 | Aug. 31, 2017 | Sep. 30, 2016
--- | --- | --- | ---
Equity [Abstract] |  |  |
Shares approved to repurchase |  | 2,000,000 |
Shares purchased | 4,426,487 |  | 1,692,016
Aggregate purchase price | $ 74,561,000 |  | $ 31,823,000
Remaining shares available for future purchases under share repurchase program, amount | $ 387,129 |  |

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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