Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 70,476	$ 51,203	$ 206,244	$ 183,980
Other comprehensive income (loss), net of tax:
Hedge gain (loss) arising during the period, net of tax of $1.9 million and $0 million in the third quarter of 2022 and 2021, respectively, and $4.0 million and $0.0 million in the first nine months of 2022 and 2021, respectively	5,880	(1,797)	12,072	(1,559)
Foreign currency translation adjustment, net of tax of $0 for each period	(35,795)	6,457	(52,819)	10,581
Unrealized loss on marketable securities, net of tax of $0 for each period	0	0	0	(307)
Amortization of net actuarial pension loss included in net income, net of tax of $0.0 million and $0.3 million in the third quarter of 2022 and 2021, respectively, and $0.2 million and $0.9 million in the first nine months of 2022 and 2021, respectively	(78)	738	447	2,214
Change in unamortized pension gain (loss) during the period related to changes in foreign currency	1,354	(291)	2,277	(385)
Other comprehensive income (loss)	(28,639)	5,107	(38,023)	10,544
Comprehensive income	$ 41,837	$ 56,310	$ 168,221	$ 194,524