Cover Page Cover Page
| Cover Page Cover Page | Mar. 05, 2020 |
| Cover Page [Abstract] | |
| Entity Address, Address Line One | 250 Campus Drive, |
| Entity Address, City or Town | Marlborough, |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01752 |
| Entity File Number | 1-36214 |
| Document Type | 8-K |
| Document Period End Date | Mar. 5, 2020 |
| Entity Registrant Name | HOLOGIC, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 04-2902449 |
| City Area Code | (508) |
| Local Phone Number | 263-2900 |
| Title of 12(b) Security | Common Stock, $.01 par value |
| Security Exchange Name | HOLX |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000859737 |
| Security Exchange Name | NASDAQ |