Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Consolidated Statements of Comprehensive Earnings
Net earnings	$ 232,368	$ 171,698	$ 208,649
Other comprehensive earnings:
Foreign currency translation adjustments	21,180	(63,026)	8,628
Net (loss) gain on foreign currency transactions designated as hedges of net investments in foreign subsidiaries	(3,090)	7,206	592
Taxes on changes on foreign currency translation adjustments	1,011	2,230	(1,433)
Foreign currency translation and transactions adjustments, net of tax	19,101	(53,590)	7,787
Unrealized gain (loss) on fair value adjustment of derivative instruments	(36,587)	89,048	(1,672)
Reclassification of net realized (gains) losses on derivatives to earnings	33,224	(68,880)	(3,702)
Taxes on changes on derivative transactions	(141)	(786)	234
Derivative adjustments, net of tax	(3,504)	19,382	(5,140)
Minimum retirement benefit liability adjustments:
Net gain arising during the period	9,401	6,318	27,809
Prior service cost arising during the period			(611)
Amortization of:
Prior service cost	720	1,004	995
Net (gain) loss	(823)	720	1,502
Foreign currency exchange rate changes on minimum retirement benefit liabilities	247	1,158	(855)
Taxes on changes on minimum retirement benefit liability adjustments	(3,250)	(1,936)	(7,312)
Pension and other postretirement benefit plan adjustments, net of tax	6,295	7,264	21,528
Total comprehensive earnings	$ 254,260	$ 144,754	$ 232,824