Shareholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	$ 10,870,064	$ 9,419,091
Other comprehensive income (loss) before reclassifications	(47,445)	22,748
Amounts reclassified from accumulated other comprehensive income	(2,491)	(530)
Total other comprehensive income (loss)	(49,936)	22,218
Shareholders' equity, ending balance	11,273,209	9,836,274
Available- for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	(369)	(495)
Other comprehensive income (loss) before reclassifications	296	87
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss)	296	87
Shareholders' equity, ending balance	(73)	(408)
Interest Rate Agreement Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	518,897	369,607
Other comprehensive income (loss) before reclassifications	(47,741)	22,661
Amounts reclassified from accumulated other comprehensive income	(2,491)	(530)
Total other comprehensive income (loss)	(50,232)	22,131
Shareholders' equity, ending balance	468,665	391,738
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	518,528	369,112
Total other comprehensive income (loss)	(49,936)	22,218
Shareholders' equity, ending balance	$ 468,592	$ 391,330