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Stockholders' Equity - Dividends (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |
Cash dividend (in dollars per share) | $ 0.1 | $ 0.1 | $ 0.075 | $ 0.075 | $ 0.10

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration