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Accrued Expenses and Other Current Liabilities - Additional Information (Details) - USD ($) $ in Millions | Jun. 29, 2024 | Sep. 30, 2023 | Jul. 01, 2023
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Payables and Accruals [Abstract] |  |  |
Capital expenditures included in other accrued liabilities | $ 2.0 | $ 1.5 | $ 0.9

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- Definition Capital expenditures included in other accrued liabilities current. + References No definition available. + Details
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Namespace Prefix: | lesl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration