| Document and Entity Information | Mar. 09, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001633978 |
| Document Type | 8-K |
| Document Period End Date | Mar. 9, 2021 |
| Entity Registrant Name | Lumentum Holdings Inc. |
| Entity Incorporation State 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 | true |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value of $0.001 per share |
| Trading Symbol | LITE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
