Details of Selected Financial Statement Captions - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Balance Sheet Related Disclosures [Abstract]
Interest	$ 308,872	$ 249,066	$ 234,297
Income taxes	15,349	14,968	15,760
Capital expenditures included in current liabilities	299,908	186,912	217,868
Interest paid, net of amount capitalized	$ 163,500	$ 117,900	$ 98,400

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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