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Earnings Per Share and Certain Related Information (Narrative) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 04, 2017 | Mar. 31, 2017 | Mar. 31, 2017 | Mar. 17, 2017 | Jul. 23, 2015
Earnings Per Share Basic [Line Items] |  |  |  |  |
Earnings available to participating securities |  | $ 600,000 | $ 1,400,000 |  |
Amount authorized to be repurchased |  |  |  |  | $ 500,000,000
Quarterly dividend per share |  |  |  | $ 0.15 |
Subsequent Event |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |
Quarterly dividend per share | $ 0.15 |  |  |  |
Dividends date declared | May 04, 2017 |  |  |  |
Dividends payment date | Jun. 16, 2017 |  |  |  |
Dividends record date | May 19, 2017 |  |  |  |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780133-109256 + Details
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