| COVER PAGE | Oct. 31, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Oct. 31, 2019 |
| Entity Registrant Name | Lumentum Holdings Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36861 |
| Entity Tax Identification Number | 47-3108385 |
| Entity Address, Address Line One | 1001 Ridder Park Drive |
| Entity Address, City or Town | San Jose |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95131 |
| City Area Code | 408 |
| Local Phone Number | 546-5483 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, par value of $0.001 per share |
| Trading Symbol | LITE |
| Security Exchange Name | NASDAQ |
| Entity Central Index Key | 0001633978 |
| Amendment Flag | false |
