Equity (Schedule of Common Stock Reserved for Future Issuances) (Details) - shares	Jun. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Exercise of outstanding stock options	916,028	1,431,190
Unvested restricted stock units	607,171
Purchases under the employee stock purchase plan	1,020,874
Issuance of stock-based awards under the Equity Plans	632,117
Purchases under the officer and director share purchase plan	88,741
Total reserved	3,264,931