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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Statement of Cash Flows [Abstract]      
Bad debt expense $ 3,445 $ 1,481 $ (120)
Deferred financing cost amortization 475 287 268
Depreciation and amortization 46,941 37,103 29,407
Loss (gain) on sale of assets 155 1,684 14,139
Non-cash compensation 12,931 5,532 4,372
Deferred income taxes (3,305) (1,126) 5,185
Accounts receivable (79,948) (93,507) 2,917
Inventories 4,149 (3,522) (1,142)
Costs and estimated earnings in excess of billings (8,674) (3,979) 3,456
Prepaid expenses and other current assets (16,455) (16,720) (7,322)
Other non-current assets (1,557) 174 2,067
Accounts payable and accrued expenses 86,460 57,894 (10,047)
Billings in excess of costs and estimated earnings 16,089 54,550 19,051
Other non-current liabilities (1,796) 423 162
Net cash provided by operating activities 286,096 234,404 153,902
Purchases of property and equipment 67,253 45,159 17,667
Proceeds from sale of assets 833 3,694 20,602
Payments to Acquire Equity Method Investments (44,900) (380) (165)
Cash received (paid) in conjunction with business combinations (52,368) (67,002) 0
Net cash used in investing activities (163,688) (108,847) 2,770
Borrowings of debt 996,400 2,896,346 2,381,562
Repayments of debt (996,400) (2,896,346) (2,464,221)
Finance lease payment (4,382) (4,257) (3,338)
Payments for Repurchase of Redeemable Noncontrolling Interest (40,000) (32,000) 0
Distribution to noncontrolling interests (8,592) (16,155) (11,491)
Purchase of treasury stock (41,644) (44,028) (8,284)
Issuance of shares 0 19 22
Net cash used in financing activities (96,069) (100,495) (105,750)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 26,339 25,062 50,922
CASH, CASH EQUIVALENTS and RESTRiCTED CASH, beginning of period 100,832 75,770 24,848
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period 127,171 100,832 75,770
Cash paid for interest 882 536 2,089
Cash paid for income taxes (net) 117,314 61,614 12,056
Bad debt expense 3,445 1,481 (120)
Issuance of shares 0 19 22
Cash and cash equivalents 127,171 100,832 75,770
Depreciation and amortization 46,941 37,103 29,407
Loss (gain) on sale of assets 155 1,684 14,139
Operating income (loss) 383,529 300,876 159,776
Deferred financing cost amortization 475 287 268
Non-cash compensation 12,931 5,532 4,372
Contingent consideration 1,145 714 277
Net income (loss) $ 311,842 $ 232,501 $ 119,787
Earnings (loss) per share, basic $ 15.22 $ 10.02 $ 4.58
Earnings (loss) per share, diluted $ 15.02 $ 9.89 $ 4.54
Weighted Average Number of Shares Outstanding, Basic 19,917,463 20,160,143 20,196,850
Weighted Average Number of Shares Outstanding, Diluted 20,182,797 20,414,932 20,413,032
Gross profit $ 859,497 $ 696,590 $ 444,539
Cost of services 2,511,971 2,187,768 1,932,688
Revenues 3,371,468 2,884,358 2,377,227
Provision for income taxes 96,805 72,165 38,761
Selling, general and administrative expenses 474,978 396,684 298,625
Cash paid for income taxes (net) 117,314 61,614 12,056
Fair Value of Assets Acquired 789 0 4,712
Noncash or Part Noncash Acquisition, Other Liabilities Assumed 0 2,790  
Increase (Decrease) in Accounts Receivable 79,948 93,507 (2,917)
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI 62,099 33,214 0
Deferred income taxes (3,305) (1,126) 5,185
Unrealized Gain (Loss) on Investments (7,485) (1,789) 0
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions (14,762) 0 0
Payments for Repurchase of Redeemable Noncontrolling Interest 40,000 32,000 0
Payment for Contingent Consideration Liability, Financing Activities $ 1,451 $ 4,074 $ 0