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Leases (Tables)
12 Months Ended
Sep. 30, 2023
Leases [Abstract]  
Lease Costs
Table 10.1: Details of Lease Costs
For the Year Ended September 30,
202320222021
(in thousands)
Operating lease cost$76,630 $90,423 $111,246 
Short-term lease cost7,729 11,642 7,044 
Variable lease cost12,417 12,032 11,124 
Total operating lease costs$96,776 $114,097 $129,414 
Future Minimum Lease Payments
Table 10.2: Future Minimum Lease Payments Under Non-cancelable Operating Leases
Office SpaceEquipmentTotal
(in thousands)
Year ended September 30, 2024$57,829 $490 $58,319 
Year ended September 30, 202552,637 242 52,879 
Year ended September 30, 202634,667 30 34,697 
Year ended September 30, 202728,043 28,052 
Year ended September 30, 202820,640 20,645 
Thereafter6,193 — 6,193 
Total minimum lease payments200,009 776 200,785 
Less: Imputed interest(21,483)(83)(21,566)
Total lease liabilities$178,526 $693 $179,219