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Earnings Per Share (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share                      
Antidilutive potential common shares excluded in computation of diluted loss per share                   700,000  
Denominator for basic earnings per share (in shares) 98,100,000 97,500,000 97,000,000 96,300,000 98,000,000 99,300,000 100,400,000 104,800,000 97,226,000 100,618,000 111,875,000
Potential common shares (in shares)                 1,500,000 1,300,000  
Denominator for diluted earnings per share (in shares) 99,700,000 99,000,000 98,300,000 97,600,000 99,700,000 100,800,000 101,800,000 105,500,000 98,657,000 101,942,000 111,875,000