Equity (Schedule of Common Stock Reserved for Future Issuances) (Details)	Sep. 30, 2013	Sep. 30, 2012
Equity [Abstract]
Exercise of outstanding stock options	1,745,948	2,032,215
Unvested restricted stock units	854,928
Purchases under the employee stock purchase plan	433,958
Issuance of stock-based awards under the Equity Plans	608,395
Exercise of outstanding warrants	400,001	750,011
Purchases under the officer and director share purchase plan	90,323
Total reserved	4,133,553