Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
3 Months Ended
Dec. 30, 2023
Jan. 26, 2024
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 30, 2023  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1  
Trading Symbol LESL  
Entity Registrant Name LESLIE’S, INC.  
Entity Central Index Key 0001821806  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --09-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   184,513,174
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-39667  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-8397425  
Entity Address, Address Line One 2005 East Indian School Road  
Entity Address, City or Town Phoenix  
Entity Address, State or Province AZ  
Entity Address, Postal Zip Code 85016  
City Area Code 602  
Local Phone Number 366-3999  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Security Exchange Name NASDAQ