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Dividend (Detail) - $ / shares |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 14, 2018 | Jun. 15, 2018 | Mar. 16, 2018 | Jan. 16, 2018 | Sep. 05, 2017 | Jun. 15, 2017 | Mar. 17, 2017 | Feb. 08, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |
Amount Paid Per Share (in Dollars per share) | $ 0.15 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.48 | $ 0.44

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Period Type: | duration

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- References No definition available. + Details
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