Shareholders' Equity - Schedule of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	$ 9,836,274	$ 9,419,091	$ 8,289,545	$ 7,906,889	$ 9,419,091	$ 7,906,889
Other comprehensive income (loss) before reclassifications					(7,055)	74,288
Amounts reclassified from accumulated other comprehensive income					(1,060)	1,488
Net current-period other comprehensive income (loss)	(30,333)	22,218	121,723	(45,947)	(8,115)	75,776
Shareholders' equity, ending balance	10,205,205	9,836,274	8,983,231	8,289,545	10,205,205	8,983,231
Available- for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance		(495)		47	(495)	47
Other comprehensive income (loss) before reclassifications					221	(230)
Amounts reclassified from accumulated other comprehensive income					0	0
Net current-period other comprehensive income (loss)					221	(230)
Shareholders' equity, ending balance	(274)		(183)		(274)	(183)
Interest Rate Agreement Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance		369,607		69,756	369,607	69,756
Other comprehensive income (loss) before reclassifications					(7,276)	74,518
Amounts reclassified from accumulated other comprehensive income					(1,060)	1,488
Net current-period other comprehensive income (loss)					(8,336)	76,006
Shareholders' equity, ending balance	361,271		145,762		361,271	145,762
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	391,330	369,112	23,856	69,803	369,112	69,803
Net current-period other comprehensive income (loss)	(30,333)	22,218	121,723	(45,947)
Shareholders' equity, ending balance	$ 360,997	$ 391,330	$ 145,579	$ 23,856	$ 360,997	$ 145,579