Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	$ 12,780,481	$ 12,157,669	$ 11,273,209	$ 10,870,064	$ 12,157,669	$ 10,870,064
Other comprehensive income (loss) before reclassifications					17,976	(17,845)
Amounts reclassified from accumulated other comprehensive income					(7,140)	(4,983)
Total other comprehensive income (loss)	(5,587)	16,423	27,108	(49,936)	10,836	(22,828)
Shareholders' equity, ending balance	13,137,965	12,780,481	11,618,639	11,273,209	13,137,965	11,618,639
Available- for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance		213		(369)	213	(369)
Other comprehensive income (loss) before reclassifications					(65)	246
Amounts reclassified from accumulated other comprehensive income					0	0
Total other comprehensive income (loss)					(65)	246
Shareholders' equity, ending balance	148		(123)		148	(123)
Interest Rate Agreement Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance		465,502		518,897	465,502	518,897
Other comprehensive income (loss) before reclassifications					18,041	(18,091)
Amounts reclassified from accumulated other comprehensive income					(7,140)	(4,983)
Total other comprehensive income (loss)					10,901	(23,074)
Shareholders' equity, ending balance	476,403		495,823		476,403	495,823
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	482,138	465,715	468,592	518,528	465,715	518,528
Total other comprehensive income (loss)	(5,587)	16,423	27,108	(49,936)
Shareholders' equity, ending balance	$ 476,551	$ 482,138	$ 495,700	$ 468,592	$ 476,551	$ 495,700