XML 52 R39.htm IDEA: XBRL DOCUMENT
v3.21.2

Share Repurchase Authorization (Tables) | 9 Months Ended
--- | ---
Sep. 25, 2021
Share Repurchase Program [Abstract] |
Summary of Share Repurchases | The following table summarizes the Company’s share repurchases for the periods indicated:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 25, |  |  | September 26, |  |  | September 25, |  |  | September 26, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Shares of common stock repurchased |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,882 |
Cost of shares repurchased |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 52,000 |
Average price paid per share |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 27.62 |

X
- Definition Share Repurchase Program [Abstract] + References No definition available. + Details
Name: | onto_ShareRepurchaseProgramAbstract
Namespace Prefix: | onto_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares remaining to be repurchased in the future period under a repurchase plan. + References No definition available. + Details
Name: | onto_ShareRepurchaseProgramTableTextBlock
Namespace Prefix: | onto_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration