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Stockholders' Equity (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 16, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Aug. 01, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 380,123,258 |  |  |  | 375,847,442 |  |  |  | 380,123,258 | 375,847,442 |  |
Common stock, shares outstanding |  | 372,923,187 |  |  |  | 368,647,371 |  |  |  | 372,923,187 | 368,647,371 |  |
Preferred stock, shares issued |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Amount of stock repurchase authorization |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Amount remaining under stock repurchase authorization |  | $ 100,000,000 |  |  |  |  |  |  |  | $ 100,000,000 |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share |  | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.0625 | $ 0.32 | $ 0.25 | $ 0.1375 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends declared 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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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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