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INCOME TAXES (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Components of the Provision for Income Taxes

The components of the provision for income taxes are as follows:

			Year Ended September 30,
(in thousands)			2025						2024						2023
Current:
Federal			$	114,973					$	136,110					$	150,273
Foreign			35,588						7,756						12,883
State			13,935						16,180						16,523
			164,496						160,046						179,679
Deferred:
Federal			(44,564)						(18,785)						(20,337)
Foreign			(30,174)						(2,102)						(1,254)
State			(3,923)						(2,304)						1,191
			(78,661)						(23,191)						(20,400)
Total provision			$	85,835					$	136,855					$	159,279

Schedule of Domestic and Foreign Income (Loss) before Income Taxes

The amounts of domestic and foreign income (loss) before income taxes are as follows:

			Year Ended September 30,
(in thousands)			2025						2024						2023
Domestic			$	339,966					$	433,553					$	584,891
Foreign			(414,079)						47,467						8,488
			$	(74,113)					$	481,020					$	593,379

Schedule of Effective Income Tax Rates as Compared to the U.S. Federal Income Tax Rate

The reconciliation of our effective income tax rates to the U.S. Federal income tax rate is as follows:

			Year Ended September 30,
			2025						2024						2023
U.S. Federal income tax rate			21.0		%				21.0		%				21.0		%
Effect of foreign taxes			(54.6)						1.3						2.1
State income taxes, net of federal tax benefit			(9.6)						2.2						2.4
Other impact of foreign operations			(15.8)						1.7						0.2
Non-deductible meals and entertainment			(5.6)						0.9						0.6
Equity compensation			(0.6)						(0.1)						(0.1)
Excess officer's compensation			(4.8)						0.8						0.4
Goodwill impairment			(54.6)						—						—
Other			8.8						0.7						0.2
Effective income tax rate			(115.8)		%				28.5		%				26.8		%

Schedule of Components of Net Deferred Tax Liabilities

The components of our net deferred tax liabilities are as follows:

			September 30,
(in thousands)			2025						2024
Deferred tax liabilities:
Property, plant and equipment			$	590,133					$	534,161
Marketable securities			—						18,877
Lease assets			26,606						—
Other			22,888						29,044
Total deferred tax liabilities			639,627						582,082
Deferred tax assets:
Pension reserves			11,889						1,477
Marketable securities			8,517						—
Self-insurance reserves			4,909						4,619
Net operating loss and other tax carryforwards			301,813						11,296
Accrued liabilities			42,389						47,838
Lease liability			29,443						—
Other			35,307						33,126
Total deferred tax assets			434,267						98,356
Valuation allowance			(418,640)						(11,755)
Net deferred tax assets			15,627						86,601
Net deferred tax liabilities			$	624,000					$	495,481

Schedule of Reconciliation of the Change in Gross Unrecognized Tax Benefits

A reconciliation of the change in our gross unrecognized tax benefits are as follows:

(in thousands)			2025						2024						2023
Unrecognized tax benefits at October 1,			$	156					$	247					$	960
Gross decreases - current period effect of tax positions			(1)						(14)						(534)
Gross increases - current period effect of tax positions1			20,485						—						6
Expiration of statute of limitations for assessments			(121)						(77)						(185)
Unrecognized tax benefits at September 30,			$	20,519					$	156					$	247

(1)Gross increases - current period effect of tax positions for the year ended September 30, 2025 are related to the acquisition of KCA Deutag.

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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