Accounts Payable and Accrued Expenses (Additional Information) (Details) - USD ($)	Apr. 02, 2022	Oct. 02, 2021	Apr. 03, 2021
Payables And Accruals [Abstract]
Capital expenditures included in other accrued liabilities	$ 2,000,000.0	$ 1,500,000	$ 0

Capital expenditures included in other accrued liabilities current.

No definition available.

Name:	lesl_CapitalExpendituresIncludedInOtherAccruedLiabilitiesCurrent
Namespace Prefix:	lesl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant