Net Income (Loss) Per Share (Schedule of Antidilutive Securities) (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-based equity awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share	2,666	0	2,666	2,950
2015 Convertible Senior Notes | Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share	5,491	0	5,491	5,491
2015 Convertible Senior Notes | Warrant associated with the convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share	5,491	0	5,491	5,491
2018 Convertible Senior Notes | Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share	4,662	4,662	4,662	4,662
2018 Convertible Senior Notes | Warrant associated with the convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share	4,662	4,662	4,662	4,662