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Leases (Tables)
 3 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease Costs Costs recorded in the three months ended December 31, 2020 and 2019, are summarized below.
Three Months Ended December 31,
(in thousands)20202019
Operating lease cost$27,734 $25,250 
Short-term lease cost1,889 2,110 
Variable lease cost3,015 3,334 
Total operating lease costs$32,638 $30,694 
Other information related to leases was as follows:
December 31, 2020
Weighted average remaining lease term (in years)2.8
Weighted average incremental borrowing rate3.81 %

Supplemental cash flow information related to leases was as follows:
Three Months Ended December 31,
(in thousands)20202019
Cash payments included in the measurement of lease liabilities$28,513 $28,100 
Operating lease liabilities arising from new or remeasured right-of-use assets 9,004 17,300 
Future Minimum Lease Payments
Future minimum lease payments for noncancelable operating leases as of December 31, 2020, are shown below.
(in thousands)Office spaceEquipmentTotal
For the years ended September 30
Remainder of 2021$52,375 $6,661 $59,036 
202256,388 3,701 60,089 
202331,731 537 32,268 
202414,715 54 14,769 
20259,788 9 9,797 
Thereafter2,219 — 2,219 
Total minimum lease payments$167,216 $10,962 $178,178 
Less: imputed interest(9,748)(270)(10,018)
Total lease liabilities$157,468 $10,692 $168,160