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Derivatives - Additional Information (Detail) $ in Millions	3 Months Ended
	Jun. 30, 2021 USD ($)
Financial Guarantee [Member]
Derivative [Line Items]
Reclassification from restricted cash and cash equivalents to cash and cash equivalents	$ 25.0
Financial Guarantee [Member] | Other Nonoperating Income (Expense) [Member]
Derivative [Line Items]
Gain loss from the cancellation of derivatives	0.1
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative liability modification of swaps	$ 12.3
Derivative instruments fixed rate of interest	2.30%
Interest Rate Swap [Member] | Two Blend and Extended Transactions [Member] | Covid-19 [Member]
Derivative [Line Items]
Derivative instruments average fixed rate of interest	1.70%
Derivative instrument extension in the term of maturity	2 years
Derivative instrument month of maturity	2024-04
Derivative liabilities notional amount	$ 96.6

X

- Definition

Derivative instrument extension in the term of maturity.

+ References

No definition available.

+ Details

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

X

- Definition

Derivative instrument month of maturity.

+ References

No definition available.

+ Details

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Namespace Prefix:	lz_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Derivative liabilities modification of swaps.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Gain loss on cancellation of derivatives.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Reclassification from restricted cash and cash equivalents to cash and cash equivalents.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

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Balance Type:	na
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

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X

- Details

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X

- Details

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X

- Details

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Period Type:

X

- Details

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- Details

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