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Leases (Tables)
 9 Months Ended
Jun. 30, 2022
Leases [Abstract]  
Schedule of Lease Expense
The components of lease expense during the three and nine months ended June 30, 2022 and 2021 were as follows:
Three Months Ended June 30,Nine Months Ended June 30,
Lease Expense2022202120222021
Operating lease expense(1)
$4,990 $5,547 $17,724 $17,137 
Finance lease expense:
Amortization of leased assets18 32 54 97 
Interest on lease liabilities1 2 2 5 
Variable lease expense1,586 947 4,059 2,804 
Sublease income(32)(119)(122)(365)
Total net lease expense$6,563 $6,409 $21,717 $19,678 
(1)     Excludes the expense for short-term leases not accounted for under ASC 842, which was not significant for the three and nine months ended June 30, 2022 and 2021.
Schedule of Supplemental Information
Supplemental balance sheet, cash flow and other information related to our leases was as follows (in thousands, except lease term and discount rate):

LeasesClassificationJune 30, 2022September 30, 2021
Assets:
Operating lease assets
Right-of-use assets for operating leases(1)
$139,881 $159,075 
Finance lease assets
Property and equipment, net(2)
40 94 
Total leased assets$139,921 $159,169 
Liabilities:
Current
   Operating lease liabilities
Operating lease liability, current portion(1)
$13,197 $14,075 
   Finance lease liabilitiesLong-term debt, current portion42 73 
Noncurrent
   Operating lease liabilities
Operating lease liability(1)
136,824 153,228 
   Finance lease liabilitiesLong-term debt— 23 
Total lease liabilities$150,063 $167,399 

(1)     As noted above, during the nine months ended June 30, 2022, our right-of-use assets and operating lease liability decreased due to the purchase of the Lisle Campus and the settlement of the existing lease.
(2)     Finance lease assets are recorded net of accumulated amortization of $0.2 million and $0.1 million as of June 30, 2022 and September 30, 2021, respectively.

Lease Term and Discount RateJune 30, 2022September 30, 2021
Weighted-average remaining lease term (in years):
   Operating leases9.159.37
   Finance leases0.571.32
Weighted average discount rate:
   Operating leases3.92 %4.31 %
   Finance leases3.08 %3.08 %

Nine Months Ended June 30,
Supplemental Disclosure of Cash Flow Information and Other Information20222021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$9,174 $13,546 
Financing cash flows from finance leases55 96 
Non-cash activity related to lease liabilities:
   Lease assets obtained in exchange for new operating lease liabilities (1)
$7,899 $14,789 
(1) Excludes the operating leases recorded for the MIAT acquisition discussed in Note 4.
Schedule Operating Lease Liabilities Maturities Maturities of lease liabilities were as follows:
As of June 30, 2022
Years ending September 30,Operating LeasesFinance Leases
Remainder of 2022$2,214 $19 
202319,853 23 
202419,656 — 
202519,917 — 
202619,674 — 
2027 and thereafter97,238 — 
Total lease payments178,552 42 
Less: interest(28,531)— 
Present value of lease liabilities150,021 42 
Less: current lease liabilities(13,197)(42)
Long-term lease liabilities$136,824 $— 
Schedule of Finance Lease Liabilities Maturities Maturities of lease liabilities were as follows:
As of June 30, 2022
Years ending September 30,Operating LeasesFinance Leases
Remainder of 2022$2,214 $19 
202319,853 23 
202419,656 — 
202519,917 — 
202619,674 — 
2027 and thereafter97,238 — 
Total lease payments178,552 42 
Less: interest(28,531)— 
Present value of lease liabilities150,021 42 
Less: current lease liabilities(13,197)(42)
Long-term lease liabilities$136,824 $—