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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dealer Incentive Liability, Advertising Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Dealer Incentive Liability |  |
Dealer incentive liability | $ 5,531 | $ 6,115
Dealer incentive expense | $ 731 | $ 829

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