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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net income $ 23,019 $ 2,536
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,124 10,470
Amortization of right-of-use assets for operating leases 12,636 11,856
Bad debt expense 2,077 1,025
Stock-based compensation 3,273 1,186
Deferred income taxes (6,283) 0
Training equipment credits earned, net (921) 504
Unrealized gain (loss) on interest rate swap 1,368 (352)
Other gains (losses), net 537 (330)
Changes in assets and liabilities:    
Receivables (8,234) 6,093
Prepaid expenses (1,439) (4,906)
Other assets (621) (773)
Notes receivable 956 (956)
Accounts payable and accrued expenses 384 (1,693)
Deferred revenue (16,809) 1,299
Income tax receivable 0 2,522
Accrued tool sets and other current liabilities 891 1,122
Operating lease liability (10,778) (13,546)
Other liabilities (4,274) (1,274)
Net cash provided by operating activities 7,906 14,783
Cash flows from investing activities:    
Cash paid for acquisition, net of cash acquired (26,514) 0
Purchase of property and equipment (69,615) (54,245)
Proceeds from disposal of property and equipment 7 6
Proceeds from maturities of held-to-maturity securities 0 37,401
Return of capital contribution from unconsolidated affiliate 188 226
Net cash used in investing activities (95,934) (16,612)
Cash flows from financing activities:    
Proceeds from term loan 38,000 31,150
Debt issuance costs related to the term loan (355) (272)
Payment of preferred stock cash dividend (2,617) (2,625)
Payments on term loans and finance leases (19,004) (162)
Payment of payroll taxes on stock-based compensation through shares withheld (633) (401)
Net cash provided by financing activities 15,391 27,690
Change in cash, cash equivalents and restricted cash (72,637) 25,861
Cash and cash equivalents, beginning of period 133,721 76,803
Restricted cash, beginning of period 12,256 12,116
Cash, cash equivalents and restricted cash, beginning of period 145,977 88,919
Cash and cash equivalents, end of period 70,713 102,856
Restricted cash, end of period 2,627 11,924
Cash, cash equivalents and restricted cash, end of period 73,340 114,780
Supplemental disclosure of cash flow information:    
Income taxes paid (refunded) 696  
Income taxes paid (refunded)   (2,443)
Interest paid 1,208 133
Training equipment obtained in exchange for services 1,247 400
Depreciation of training equipment obtained in exchange for services 691 922
Accounts payable and accrued expenses for capital expenditures (374) (621)
Preferred dividends payable 1,296 1,313
CARES Act funds received for student emergency grants (See Note 21) 6,689 11,902
CARES Act funds disbursed for student emergency grants (See Note 21) (6,774) (11,528)
CARES Act funds received for institutional costs $ 0 $ 2,677