| Cover Page | Oct. 28, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 28, 2020 |
| Entity Registrant Name | KLA CORPORATION |
| Entity Central Index Key | 0000319201 |
| Document Fiscal Year Focus | 2021 |
| Document Fiscal Period Focus | Q1 |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, $0.001 par value per share |
| Trading Symbol | KLAC |
| Security Exchange Name | NASDAQ |
| Entity File Number | 000-09992 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 04-2564110 |
| Entity Address, Address Line One | One Technology Drive |
| Entity Address, City or Town | Milpitas |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95035 |
| City Area Code | 408 |
| Local Phone Number | 875-3000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
