Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 63,504	$ 89,679	$ 138,539	$ 135,768
Other comprehensive income (loss), net of tax:
Hedge gain (loss) arising during the period, net of tax of $0.7 million and $1.2 million in the second quarter of 2023 and 2022, respectively, and $4.5 million and $(2.0) million in the first six months of 2023 and 2022, respectively	(1,999)	3,697	(13,484)	6,192
Foreign currency translation adjustment, net of tax of $0 for each period	8,747	(11,356)	68,776	(17,024)
Amortization of net actuarial pension loss included in net income, net of tax of $0 million and $0.1 million in the second quarter of 2023 and 2022, respectively, and $0 million and $0.2 million in the first six months of 2023 and 2022, respectively	41	260	82	525
Change in unamortized pension gain (loss) during the period related to changes in foreign currency	(65)	538	(414)	923
Other comprehensive income (loss)	6,724	(6,861)	54,960	(9,384)
Comprehensive income	$ 70,228	$ 82,818	$ 193,499	$ 126,384