SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)

12 Months Ended

Sep. 30, 2025

Balance Sheet Related Disclosures [Abstract]

Schedule of Activity in the Allowance for Bad Debts

The following reflects the activity in our allowance for expected credit losses on trade receivables for fiscal years 2025, 2024 and 2023:


	Year Ended September 30,
(in thousands)	2025		2024		2023
Allowance for credit losses:
Balance at October 1,	$	2,977	$	2,688	$	2,975
Acquisition of KCA Deutag1	13,094		—		—
Provision for credit loss	765		289		534
(Write-off) recovery of credit loss	2,811		—		(821)
Balance at September 30,	$	19,647	$	2,977	$	2,688

(1)Allowance for credit losses acquired in the KCA Deutag Acquisition were measured at fair value at the Acquisition Date. Refer to Note 3—Business Combination for additional information regarding the Acquisition.

Schedule of Accounts Receivable, Prepaid Expenses and Other Current Assets, Accrued Liabilities and Long-Term Liabilities

Accounts receivable, prepaid expenses and other current assets, net, accrued liabilities and noncurrent liabilities —other at September 30, 2025 and 2024 consist of the following:


	Year Ended September 30,
(in thousands)	2025		2024
Accounts receivable, net of allowance:
Trade receivables	$	752,808	$	418,586
Income tax receivable	29,836		18
Total accounts receivable, net of allowance	$	782,644	$	418,604
Prepaid expenses and other current assets, net:
Deferred mobilization	$	20,291	$	8,329
Prepaid insurance	14,855		10,277
Prepaid value added tax	19,263		5,644
Prepaid maintenance and rent	16,888		12,802
Accrued demobilization, net	4,969		4,563

Prepaid equipment	1,516		23,249
Insurance recoverable	4,486		6,706
Other	15,250		4,849
Total prepaid expenses and other current assets, net	$	97,518	$	76,419
Accrued liabilities:
Accrued operating costs	$	116,743	$	60,179
Payroll, benefits, and restructuring costs	174,974		86,855
Taxes payable, other than income tax	74,007		36,339
Self-insurance liabilities	39,067		41,040
Deferred income	38,083		10,432
Deferred mobilization revenue	21,740		8,626
Accrued income taxes	11,871		7,020
Interest payable	21,898		2,690


Operating lease liability	35,960		16,997
Litigation and claims	6,417		5,881
Other	24,095		10,782
Total accrued liabilities	$	564,855	$	286,841
Noncurrent liabilities — Other:
Other non-qualified retirement plans	$	22,747	$	21,753
Self-insurance liabilities	81,726		41,040

Deferred revenue	30,121		10,123
Uncertain tax positions including interest and penalties	23,948		790
Operating lease liability	110,120		59,733
Other	1,954		171
Total noncurrent liabilities — other	$	270,616	$	133,610