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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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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.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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