|
Document and Entity Information
|
6 Months Ended | |
|---|---|---|
|
Mar. 28, 2015
|
Apr. 24, 2015
|
|
| Document And Entity Information [Abstract] | ||
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Mar. 28, 2015 | |
| Document Fiscal Year Focus | 2015 | |
| Document Fiscal Period Focus | Q2 | |
| Entity Registrant Name | HOLOGIC INC | |
| Entity Central Index Key | 0000859737 | |
| Current Fiscal Year End Date | --09-26 | |
| Entity Filer Category | Large Accelerated Filer | |
| Entity Common Stock, Shares Outstanding | 280,969,986 |