Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	$ 13,558,890	$ 12,157,669
Other comprehensive income (loss) before reclassifications	1	19,581
Amounts reclassified from accumulated other comprehensive income	(4,806)	(3,158)
Total other comprehensive income (loss)	(4,805)	16,423
Shareholders' equity, ending balance	14,282,892	12,780,481
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	475,015	465,715
Total other comprehensive income (loss)	(4,805)	16,423
Shareholders' equity, ending balance	470,210	482,138
Available- for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	209	213
Other comprehensive income (loss) before reclassifications	1	(138)
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss)	1	(138)
Shareholders' equity, ending balance	210	75
Interest Rate Agreement Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	474,806	465,502
Other comprehensive income (loss) before reclassifications	0	19,719
Amounts reclassified from accumulated other comprehensive income	(4,806)	(3,158)
Total other comprehensive income (loss)	(4,806)	16,561
Shareholders' equity, ending balance	$ 470,000	$ 482,063