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Consolidated Balance Sheets (Parenthetical) (USD $)
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Mar. 31, 2015
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Sep. 30, 2014
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| Statement of Financial Position [Abstract] | ||
| Common stock, par value (in dollars per share) | ||
| Common stock, shares issued | 63,600,000.0us-gaap_CommonStockSharesIssued | 63,500,000.0us-gaap_CommonStockSharesIssued |
| Common stock, shares outstanding | 62,900,000.0us-gaap_CommonStockSharesOutstanding | 62,900,000.0us-gaap_CommonStockSharesOutstanding |
| Treasury stock, shares | 700,000.0us-gaap_TreasuryStockNumberOfSharesHeld | 600,000.0us-gaap_TreasuryStockNumberOfSharesHeld |
| X | ||||||||||
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- Definition
Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number of shares held for each class of treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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