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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net income $ 15,539 $ 44,262
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 28,361 24,452
Amortization of right-of-use assets for operating leases 19,656 17,492
Provision for credit losses 22,403 15,063
Stock-based compensation 9,426 6,402
Deferred income taxes 1,999 579
Training equipment credits earned, net 487 (108)
Unrealized gain (loss) on interest rate swaps, net of taxes 121 (92)
Other gains (losses), net 545 1,179
Changes in assets and liabilities:    
Receivables (26,477) (21,895)
Prepaid expenses and other current assets (11,684) (4,499)
Other assets 2,155 (5,383)
Notes receivable (4,440) (4,051)
Accounts payable, accrued expenses and other current liabilities 4,371 6,455
Deferred revenue (20,805) (25,495)
Income tax payable/receivable (7,064) 3,598
Operating lease liabilities (15,167) (16,758)
Other liabilities (2,024) (975)
Net cash provided by operating activities 17,402 40,226
Cash flows from investing activities:    
Purchase of property and equipment (80,900) (25,499)
Capitalized costs for intangible assets (4,496) 0
Purchase of investments (57,347) (54,648)
Proceeds from sale of investments 31,668 0
Proceeds received upon maturity of investments 31,300 1,874
Proceeds from insurance policy 37 0
Net cash used in investing activities (79,738) (78,273)
Cash flows from financing activities:    
Proceeds from revolving credit facility 195,000 6,000
Payments on revolving credit facility (120,000) (56,000)
Payment of term loans and finance leases (2,133) (2,010)
Proceeds from stock option exercises 0 659
Payment of payroll taxes on stock-based compensation through shares withheld (8,730) (4,675)
Net cash provided by (used in) financing activities 64,137 (56,026)
Change in cash, cash equivalents and restricted cash 1,801 (94,073)
Cash and cash equivalents, beginning of period 127,361 161,900
Restricted cash, beginning of period 6,769 5,572
Cash, cash equivalents and restricted cash, beginning of period 134,130 167,472
Cash and cash equivalents, end of period 130,060 70,672
Restricted cash, end of period 5,871 2,727
Cash, cash equivalents and restricted cash, end of period 135,931 73,399
Supplemental disclosure of cash flow information:    
Income taxes paid (refunds received), net 13,313 10,364
Interest paid 3,082 4,946
Supplemental schedule of noncash investing and financing activities:    
Training equipment obtained in exchange for services 6,336 930
Depreciation of training equipment obtained in exchange for services 833 502
Change in accrued capital expenditures during the period $ 2,407 $ (1,321)