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Stockholders' Equity (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 15, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Aug. 01, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 384,036,150 |  |  |  | 380,123,258 |  |  |  | 384,036,150 | 380,123,258 |  |
Common stock, shares outstanding |  | 374,986,079 |  |  |  | 372,923,187 |  |  |  | 374,986,079 | 372,923,187 |  |
Preferred stock, shares issued |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Treasury Stock, Common, Shares |  |  |  |  |  |  |  |  |  | 1,850,000 |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  |  | $ 60,600,000 | $ 0 | $ 0 |
Amount of stock repurchase authorization |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000
Amount remaining under stock repurchase authorization |  | $ 200,000,000 |  |  |  |  |  |  |  | $ 200,000,000 |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share |  | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.40 | $ 0.32 | $ 0.25 |
Cash dividends paid per common share |  | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.125 |  |  |  |  |  |  |  |  |  |  |  |

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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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- 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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