Equity (Schedule of Common Stock Reserved for Future Issuances) (Details)	Mar. 31, 2014	Sep. 30, 2013
Equity [Abstract]
Exercise of outstanding stock options	1,674,388	1,745,948
Unvested restricted stock units	1,113,047
Purchases under the employee stock purchase plan	1,245,506
Issuance of stock-based awards under the Equity Plans	1,037,540
Exercise of outstanding warrants	400,001	400,001
Purchases under the officer and director share purchase plan	88,741
Total reserved	5,559,223