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Commitments and Contingencies - Additional Information (Detail) - Non-cancellable Agreements With Vendors - Advertising Media and Other Commitments $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Other Commitments [Line Items]
Minimum non-cancellable commitment	$ 6.8
Non-cancellable commitment pay period	2 years
Contractual obligation	$ 60.1
Contractual obligation pay period	5 years
Contractual obligation remainder to be paid	$ 44.7

X

- Definition

Contractual Obligation Pay Period

+ References

No definition available.

+ Details

Name:	lz_ContractualObligationPayPeriod
Namespace Prefix:	lz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual Obligation, to be Paid, Remaining Amount

+ References

No definition available.

+ Details

Name:	lz_ContractualObligationToBePaidRemainingAmount
Namespace Prefix:	lz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum non-cancellable commitment.

+ References

No definition available.

+ Details

Name:	lz_MinimumNonCancellableCommitment
Namespace Prefix:	lz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Non Cancellable Commitment Pay Period

+ References

No definition available.

+ Details

Name:	lz_NonCancellableCommitmentPayPeriod
Namespace Prefix:	lz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	lz_AgreementsAxis=lz_NonCancellableAgreementsWithVendorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=lz_AdvertisingMediaAndOtherCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: