Long-Term Debt - Credit and Guaranty Agreement (Details) $ in Millions	Dec. 07, 2020 USD ($) D	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Deposit account as restricted cash in other assets		$ 5
ABL Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30	30
Applicate margin rate (as a percent)	2.50%
Unused capacity commitment fee (as a percent)	0.50%
Designated action and Excess Availability	30 days
Fixed charge coverage ratio	1.10
Minimum fixed charge coverage ratio percentage	15.00%
Consecutive business days \| D	3
ABL Credit Facility \| LIBOR
Debt Instrument [Line Items]
Variable interest rate (as a percent)	0.75%
Term Loan B due 2022
Debt Instrument [Line Items]
Minimum amount to be maintained in deposit account	$ 5
Minimum liquidity to be maintained as on last day of each month.	$ 15
Deposit account as restricted cash in other assets		$ 5

The applicable margin interest rate per annum on debt instrument.

No definition available.

Name:	lci_DebtInstrumentApplicableMarginRate
Namespace Prefix:	lci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective commitments under the credit facility for consecutive business days in the calculation of excess availability under the debt instrument.

+ References

No definition available.

+ Details

Name:	lci_DebtInstrumentExcessAvailabilityCalculationConsecutiveBusinessDays
Namespace Prefix:	lci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the threshold excess availability percentage considered as trigger for testing the minimum fixed charge coverage ratio under the debt instrument covenant.

+ References

No definition available.

+ Details

Name:	lci_DebtInstrumentMinimumFixedChargeCoverageTestingTriggerThresholdExcessAvailabilityPercentage
Namespace Prefix:	lci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The period for which excess availability exceeding the agreed up on thresholds to be maintained before the date of designated action so that the payment conditions are deemed satisfied.

+ References

No definition available.

+ Details

Name:	lci_DebtInstrumentPeriodForWhichExcessAvailabilityToBeMaintainedBeforeDateOfDesignatedAction
Namespace Prefix:	lci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the threshold fixed charge coverage ratio under the debt instrument.

+ References

No definition available.

+ Details

Name:	lci_DebtInstrumentThresholdFixedChargeCoverageRatio
Namespace Prefix:	lci_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum amount to be maintained in deposit account

+ References

No definition available.

+ Details

Name:	lci_MinimumAmountToBeMaintainedInDepositAccount
Namespace Prefix:	lci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Minimum liquidity to be maintained as on last day of each month.

+ References

No definition available.

+ Details

Name:	lci_MinimumLiquidityToBeMaintainedAsOnLastDayOfEachMonth
Namespace Prefix:	lci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_RestrictedCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=lci_AblCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=lci_TermLoanBFacilityDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: