| Document And Entity Information | Apr. 27, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | The foregoing information (including the exhibit hereto) is being furnished under “Item 2.02 Results of Operations and Financial Condition” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing. |
| Document Period End Date | Apr. 27, 2021 |
| Entity Registrant Name | ACCURAY INCORPORATED |
| Entity Central Index Key | 0001138723 |
| Entity File Number | 001-33301 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 20-8370041 |
| Entity Address, Address Line One | 1310 Chesapeake Terrace |
| Entity Address, City or Town | Sunnyvale |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94089 |
| City Area Code | 408 |
| Local Phone Number | 716-4600 |
| 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 $0.001 per share |
| Trading Symbol | ARAY |
| Security Exchange Name | NASDAQ |
