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Restructuring (Additional Information) (Details) $ in Thousands | 12 Months Ended
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Dec. 30, 2023 USD ($)
Restructuring Charges [Abstract] |
Restructuring cost in operating expenses | $ 3,571
Restructuring cost in cost of goods sold | $ 7,027

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- Definition Restructuring cost recored to cost of goods sold for inventory write-downs. + References No definition available. + Details
Name: | onto_RestructuringCostInCostOfGoodsSold
Namespace Prefix: | onto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Restructuring cost recorded in operating expense for employee severance + References No definition available. + Details
Name: | onto_RestructuringCostInOperatingExpenses
Namespace Prefix: | onto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RestructuringChargesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration