COMPUTATION OF NET LOSS PER SHARE Schedule of Dilutive Common Shares Excluded from the Computation (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	2,614	1,701	16,731	14,617
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	1,477	1,350	1,809	1,429
Outstanding restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	810	343	1,702	287
Outstanding warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	0	8	0	8
ESPP Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	327	0	327	0
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	0	0	674	674
2014 Convertible debentures
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	0	0	10,332	10,332
Term B Loan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potential common stock excluded from calculation (in shares)	0	0	1,887	1,887