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Common and Preferred Stock (Details) - $ / shares | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Class of Stock Disclosures [Abstract] |  |
Shares of common stock reserved for issuance under stock-based compensation plans | 34,300,000 |
Common shares repurchased | 19,900,000 | 15,100,000
Treasury shares re-issued | 1,800,000 | 2,600,000
Shares of preferred stock authorized | 5,400,000 | 5,400,000
Par value of preferred stocked authorized | $ 2.50 | $ 2.50
Shares of preferred stock issued | 0 | 0

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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: 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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