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Supplemental Disclosures (Tables)
 9 Months Ended
Jun. 30, 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
(dollars in thousands)June 30,
2020		September 30, 2019June 30,
2019		September 30, 2018
Cash and cash equivalents$81,548  $105,565  $71,084  $349,245  
Restricted cash (recorded within "other current assets")14,440  10,927  7,885  7,314  
Cash, cash equivalents and restricted cash$95,988  $116,492  $78,969  $356,559  
Restrictions on Cash and Cash Equivalents A reconciliation of these balances is shown below.
 Balance as of
(dollars in thousands)June 30,
2020		September 30, 2019June 30,
2019		September 30, 2018
Cash and cash equivalents$81,548  $105,565  $71,084  $349,245  
Restricted cash (recorded within "other current assets")14,440  10,927  7,885  7,314  
Cash, cash equivalents and restricted cash$95,988  $116,492  $78,969  $356,559