Condensed Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Condensed Consolidated Statements of Comprehensive Earnings
Net earnings	$ 68,313	$ 91,318	$ 109,883	$ 144,691
Other comprehensive earnings:
Foreign currency translation adjustments	(8,789)	(13,355)	8,539	(2,202)
Net (loss)/gain on foreign currency transactions designated as hedges of net investments in foreign subsidiaries	(2,329)	650	(102)	(395)
Taxes on changes in foreign currency translation adjustments	(2,555)	130	(871)	(210)
Foreign currency translation and transactions adjustments, net of tax	(13,673)	(12,575)	7,566	(2,807)
Unrealized (loss)/gain on fair value adjustment of derivative instruments	8,892	45,298	(21,766)	34,004
Reclassification of net realized (gain)/loss on derivatives to earnings	(20,683)	(7,262)	277	4,394
Taxes on changes in derivative transactions	1,543	(790)	203	(772)
Derivative adjustments, net of tax	(10,248)	37,246	(21,286)	37,626
Amortization of pension and other postretirement plan:
Net prior service cost	250	240	498	481
Net loss	377	628	747	1,259
Foreign currency exchange rate changes on pension and other postretirement benefit plan liabilities	453	1,225	(1,244)	(277)
Taxes on changes in pension and other postretirement benefit plan liability adjustments, net of foreign currency exchange rate changes	(284)	(592)	72	(352)
Pension and other postretirement benefit plan adjustments, net of tax	796	1,501	73	1,111
Total comprehensive earnings	$ 45,188	$ 117,490	$ 96,236	$ 180,621