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Supplemental Disclosures (Tables)
 3 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Cash and Cash Equivalents A reconciliation of these balances is shown below.
 Balance as of
(in thousands)December 31,
2020		September 30, 2020December 31,
2019
Cash and cash equivalents$132,597 $71,737 $149,515 
Restricted cash (recorded within "prepaid expenses and other current assets")17,221 16,824 11,434 
Cash, cash equivalents, and restricted cash$149,818 $88,561 $160,949 
Restrictions on Cash and Cash Equivalents A reconciliation of these balances is shown below.
 Balance as of
(in thousands)December 31,
2020		September 30, 2020December 31,
2019
Cash and cash equivalents$132,597 $71,737 $149,515 
Restricted cash (recorded within "prepaid expenses and other current assets")17,221 16,824 11,434 
Cash, cash equivalents, and restricted cash$149,818 $88,561 $160,949