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Supplemental Disclosures (Tables)
 6 Months Ended
Mar. 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
(dollars in thousands)March 30,
2020		September 30, 2019March 31,
2019		September 30, 2018
Cash and cash equivalents$126,257  $105,565  $46,799  $349,245  
Restricted cash (recorded within "other current assets")12,485  10,927  7,679  7,314  
Cash, cash equivalents and restricted cash138,742  116,492  54,478  356,559  
Restrictions on Cash and Cash Equivalents A reconciliation of these balances is shown below.
 Balance as of
(dollars in thousands)March 30,
2020		September 30, 2019March 31,
2019		September 30, 2018
Cash and cash equivalents$126,257  $105,565  $46,799  $349,245  
Restricted cash (recorded within "other current assets")12,485  10,927  7,679  7,314  
Cash, cash equivalents and restricted cash138,742  116,492  54,478  356,559