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Condensed Consolidated Statements of Stockholders’ Equity (Parenthetical) - $ / shares		9 Months Ended
	May 08, 2023	Sep. 30, 2023
Capital Return Program
Declared cash dividend (in dollars per share)	$ 1.09	$ 1.09

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=ontf_CapitalReturnProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: