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- Definition

Variable Interest Entity, Obligation To Absorb Risk, Percentage Of Equity

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Variable Interest Entities- Investments, Equity Method and Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jul. 01, 2022	Apr. 08, 2021	Feb. 28, 2021	Oct. 01, 2019
Schedule of Equity Method Investments [Line Items]
Obligation to absorb risk of loss, percentage of partner's equity	100.00%		100.00%
Revenues	$ 477,797	$ 426,728	$ 913,643	$ 792,996
Operating Expenses	(125,555)	(110,586)	(233,852)	(208,316)
Operating profit (loss)	$ 23,457	19,572	$ 46,689	33,860
Frontier
Schedule of Equity Method Investments [Line Items]
Remaining percentage to be acquired	40.00%		40.00%
Percentage of voting interests acquired					32.00%	8.00%		60.00%
Frontier \| Maximum
Schedule of Equity Method Investments [Line Items]
Remaining percentage to be acquired							10.00%
Treated Water Outsourcing
Schedule of Equity Method Investments [Line Items]
Partnership interest			50.00%
Revenues		796		1,641
Operating Expenses		(703)		(1,440)
Operating profit (loss)		93		201
Frontier
Schedule of Equity Method Investments [Line Items]
Revenues		6,414		13,363
Operating Expenses		(6,149)		(12,135)
Operating profit (loss)		$ 265		$ 1,228