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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net income $ 2,648 $ 14,822
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,248 3,679
Amortization of right-of-use assets for operating leases 4,120 4,472
Bad debt expense 535 560
Stock-based compensation 1,169 706
Deferred income taxes 1,068 (1,893)
Training equipment credits earned, net (83) (147)
Unrealized (loss) gain on interest rate swap (126) 173
Other (gains) losses, net (143) (148)
Changes in assets and liabilities:    
Receivables 4,657 4,920
Prepaid expenses (1,438) (590)
Other assets 2,079 (29)
Notes receivable (622) (1,514)
Accounts payable and accrued expenses (15,925) (8,367)
Deferred revenue 4,634 (8,666)
Operating lease liability (4,963) (2,567)
Other liabilities (46) (2,955)
Net cash provided by operating activities 2,812 2,456
Cash flows from investing activities:    
Cash paid for acquisition, net of cash acquired (16,973) (26,142)
Purchase of property and equipment (6,782) (10,792)
Proceeds from maturities of held-to-maturity securities 29,000 0
Return of capital contribution from unconsolidated affiliate 0 75
Net cash provided by (used in) investing activities 5,245 (36,859)
Cash flows from financing activities:    
Proceeds from revolving credit facility 90,000 0
Debt issuance costs related to the revolving credit facility (484) 0
Payments on term loans and finance leases (273) (216)
Payment of payroll taxes on stock-based compensation through shares withheld (525) (301)
Net cash provided by (used in) financing activities 88,718 (517)
Change in cash, cash equivalents and restricted cash 96,775 (34,920)
Cash and cash equivalents, beginning of period 66,452 133,721
Restricted cash, beginning of period 3,544 12,256
Cash, cash equivalents and restricted cash, beginning of period 69,996 145,977
Cash and cash equivalents, end of period 162,229 99,513
Restricted cash, end of period 4,542 11,544
Cash, cash equivalents and restricted cash, end of period 166,771 111,057
Supplemental disclosure of cash flow information:    
Interest paid 1,465 223
Training equipment obtained in exchange for services 174 221
Depreciation of training equipment obtained in exchange for services 198 238
Accounts payable and accrued expenses for capital expenditures 2,837 3,651
Preferred dividends payable 1,277 1,323
CARES Act funds received for student emergency grants 0 2,816
CARES Act funds disbursed for student emergency grants $ 0 $ (2,900)