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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dealer Incentive Liability, Advertising Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Dealer Incentive Liability
Dealer incentive liability	$ 4,242	$ 5,531
Dealer incentive expense	$ 336	$ 731

X

- Definition

Represents the amount of dealer incentive expense incurred by entity during the period.

+ References

No definition available.

+ Details

Name:	legh_DealerIncentiveExpense
Namespace Prefix:	legh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	legh_DealerIncentiveLiabilityAbstract
Namespace Prefix:	legh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of dealer incentive liability outstanding.

+ References

No definition available.

+ Details

Name:	legh_DealerIncentiveLiabilityNoncurrent
Namespace Prefix:	legh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant