Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Sep. 30, 2014
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