Summary of Significant Accounting Policies (Effect of Revision on Affected Line Items Within Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022
Current assets:
Cash and cash equivalents	$ 219,306			$ 260,826	$ 272,194	$ 313,760	$ 206,284	$ 325,834
Restricted cash	1,896			3,600	2,881	3,417	3,726	4,161
Prepaid expenses and other current assets	70,050	$ 63,584	$ 61,366	62,853	102,473	103,087	114,645
Total current assets	418,085	391,817	381,109	475,031	480,297	533,548	424,197
Noncurrent assets:
Property and equipment, net	248,524	239,657	235,297	246,669	244,649	246,563	272,342	281,165
Other assets, net	103,184	96,720	88,029	83,628	80,624	73,338	119,656	121,046
Total noncurrent assets	$ 2,323,332	2,323,217	2,319,816	2,319,130	2,330,244	2,333,569	2,419,690
As Reported
Current assets:
Cash and cash equivalents				262,438	273,689	315,373	207,776	327,515
Restricted cash				1,988	1,386	1,804	2,234	2,480
Prepaid expenses and other current assets		59,401	58,356	60,750	100,715	102,573	113,564
Total current assets		387,634	378,099	472,928	478,539	533,034	423,116
Noncurrent assets:
Property and equipment, net		272,792	260,484	264,766	258,522	252,797	275,617	281,581
Other assets, net		67,768	65,852	67,634	68,509	67,618	116,613	120,630
Total noncurrent assets		2,327,400	2,322,826	2,321,233	2,332,002	2,334,083	2,419,922
Adjustment
Current assets:
Cash and cash equivalents				(1,612)	(1,495)	(1,613)	(1,492)	(1,681)
Restricted cash				1,612	1,495	1,613	1,492	1,681
Prepaid expenses and other current assets		4,183	3,010	2,103	1,758	514	1,081
Total current assets		4,183	3,010	2,103	1,758	514	1,081
Noncurrent assets:
Property and equipment, net		(33,135)	(25,187)	(18,097)	(13,873)	(6,234)	(3,275)	(416)
Other assets, net		28,952	22,177	15,994	12,115	5,720	3,043	$ 416
Total noncurrent assets		$ (4,183)	$ (3,010)	$ (2,103)	$ (1,758)	$ (514)	$ (232)