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Equity-Based Compensation - Summary of RSU Activity under Plan (Parenthetical) (Details) - shares shares in Millions | 12 Months Ended
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Oct. 01, 2022 | Oct. 02, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |
Awards converted to RSUs |  | 4.8
Number of trading days | 20 days |

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- Definition Number of trading days. + References No definition available. + Details
Name: | lesl_NumberOfTradingDays
Namespace Prefix: | lesl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Share-based compensation arrangement by share-based payment award, options, converted to restricted stock units. + References No definition available. + Details
Name: | lesl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedToRestrictedStockUnits
Namespace Prefix: | lesl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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