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Business Combination (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2025	Sep. 27, 2025	Jun. 27, 2025
Business Combination [Abstract]
AgreedUponCashToAquireBusiness			$ 475.0
AgreedUponCommonStockSharesToAquireBusiness			706,215
AquisitionTransactionRelatedCosts	$ 2.1	$ 4.6

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- Definition

AgreedUponCashToAquireBusiness

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No definition available.

+ Details

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Period Type:	instant

X

- Definition

AgreedUponCommonStockSharesToAquireBusiness

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No definition available.

+ Details

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- Definition

AquisitionTransactionRelatedCosts

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No definition available.

+ Details

Name:	onto_AquisitionTransactionRelatedCosts
Namespace Prefix:	onto_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

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