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Reconciliation of Unrecognized Tax Benefits (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized tax benefit	$ 20.0	$ 19.6

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- Definition

Unrecognized tax benefit presented net from deferred tax asset.

+ References

No definition available.

+ Details

Name:	chkp_UnrecognizedTaxBenefitPresentedNetFromDeferredTaxAsset
Namespace Prefix:	chkp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration