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Earnings Per Share (Details) - shares
shares in Thousands
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
Denominator for basic earnings per share (in shares) 98,100 97,500 97,000 96,300 98,000 99,300 100,400 104,800 97,226 100,618 111,875
Potential common shares (in shares)                 1,500 1,300  
Denominator for diluted earnings per share (in shares) 99,700 99,000 98,300 97,600 99,700 100,800 101,800 105,500 98,657 101,942 111,875