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Equity-Based Compensation - Summary of Stock Options Activity (Parenthetical) (Details)	6 Months Ended
	Apr. 02, 2022 USD ($)
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock option vested	$ 550,736

X

- Definition

Performance vesting stock options vested.

+ References

No definition available.

+ Details

Name:	lesl_PerformanceVestingStockOptionsVested
Namespace Prefix:	lesl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: