Commitments and Contingencies - Future Maturities of Long-term Debt, Finance Lease and Contractual Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Schedule of Investments [Line Items]
Total	$ 53,135,017
2025	7,815,979
2026	11,404,813
2027	7,715,520
2028	6,272,544
2029	9,267,525
Thereafter	$ 10,658,636
Interest rate (as a percent)	0.25%
Senior Secured Notes 6.75 Percent Due 2030
Schedule of Investments [Line Items]
Interest rate (as a percent)	6.75%	6.75%
Convertible Secured Notes 3.875 Percent Due 2030
Schedule of Investments [Line Items]
Interest rate (as a percent)	3.875%	3.875%
Long-term debt obligations
Schedule of Investments [Line Items]
Total	$ 27,091,651
2025	917,557
2026	7,195,431
2027	4,350,278
2028	3,552,655
2029	6,861,869
Thereafter	4,213,861
Interest expense on long-term debt
Schedule of Investments [Line Items]
Total	8,136,650
2025	2,194,342
2026	2,077,099
2027	1,598,233
2028	1,135,306
2029	872,514
Thereafter	259,156
Finance lease obligations
Schedule of Investments [Line Items]
Total	67,199
2025	30,381
2026	34,290
2027	2,528
Interest expense on finance lease obligations
Schedule of Investments [Line Items]
Total	7,355
2025	5,011
2026	2,298
2027	46
Other long-term obligations
Schedule of Investments [Line Items]
Total	9,745,695
2025	1,899,449
2026	1,490,330
2027	1,163,061
2028	1,027,757
2029	990,547
Thereafter	3,174,551
Operating lease obligations
Schedule of Investments [Line Items]
Total	5,882,169
2025	569,819
2026	600,545
2027	601,316
2028	556,826
2029	542,595
Thereafter	3,011,068
Purchase obligations
Schedule of Investments [Line Items]
Total	2,204,298
2025	2,199,420
2026	4,820
2027	$ 58