COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) Claim
COMMITMENTS AND CONTINGENCIES [Abstract]
Number of claims to dismiss \| Claim	3
Number of claims \| Claim	4
Outstanding net loan commitment	$ 30.0
Future employment contract commitments	7.9
Surety bonds	$ 12.8

Represents the commitments related to future employment contract.

No definition available.

Name:	linc_FutureEmploymentContractCommitments
Namespace Prefix:	linc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of claims finding that the ruling on the claim for student and technology fees was premature.

+ References

No definition available.

+ Details

Name:	linc_NumberOfClaims
Namespace Prefix:	linc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of claims court granted the Company's motion to dismiss.

+ References

No definition available.

+ Details

Name:	linc_NumberOfClaimsToDismiss
Namespace Prefix:	linc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Amount of letters of credit and other surety bonds that are available for the future payment of malpractice claims.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 450
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6491354&loc=d3e6049-115624

+ Details

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

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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