Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	$ 12,157,669	$ 10,870,064
Other comprehensive income (loss) before reclassifications	19,581	(47,445)
Amounts reclassified from accumulated other comprehensive income	(3,158)	(2,491)
Total other comprehensive income (loss)	16,423	(49,936)
Shareholders' equity, ending balance	12,780,481	11,273,209
Available- for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	213	(369)
Other comprehensive income (loss) before reclassifications	(138)	296
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss)	(138)	296
Shareholders' equity, ending balance	75	(73)
Interest Rate Agreement Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	465,502	518,897
Other comprehensive income (loss) before reclassifications	19,719	(47,741)
Amounts reclassified from accumulated other comprehensive income	(3,158)	(2,491)
Total other comprehensive income (loss)	16,561	(50,232)
Shareholders' equity, ending balance	482,063	468,665
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	465,715	518,528
Total other comprehensive income (loss)	16,423	(49,936)
Shareholders' equity, ending balance	$ 482,138	$ 468,592