Equity (Schedule of Common Stock Reserved for Future Issuances) (Details) - shares	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Exercise of outstanding stock options	696,459	1,431,190
Unvested restricted stock units	570,231
Purchases under the employee stock purchase plan	971,728
Issuance of stock-based awards under the Equity Plans	625,459
Purchases under the officer and director share purchase plan	88,741
Issuance of stock-based awards under the 2007 Directors' Stock Award Plan, as amended	208,162
Total reserved	3,160,780