Net Income (Loss) per Share - Narrative (Details)	Sep. 30, 2014	Sep. 30, 2013	Sep. 29, 2013
Earnings Per Share [Abstract]
Number of shares issued or committed for issuance under outstanding stock options	9,111,725	7,081,950
Number of shares of restricted stock and shares reserved for restricted stock units outstanding	1,144,432	763,559
Preferred stock shares outstanding			27,000
Number of common stock issuable upon conversion of remaining cumulative convertible preferred stock		6,065,075