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Summary of Business and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2020
Jul. 01, 2020
Jun. 30, 2020
Accounting Policies [Abstract]      
Present value of lease liabilities $ 42,285 $ 41,300  
Operating leases $ 30,142 $ 29,700 $ 0
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member    
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List] slqt:AccountingStandardsUpdate201602ModifiedRetrospectiveMember