Condensed Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Condensed Consolidated Statements of Comprehensive Earnings
Net earnings	$ 41,570	$ 53,373
Other comprehensive earnings:
Foreign currency translation adjustments	21,782	11,153
Net loss on foreign currency transactions designated as hedges of net investments in foreign subsidiaries	(2,227)	(1,045)
Taxes on changes in foreign currency translation adjustments	1,684	(340)
Foreign currency translation and transactions adjustments, net of tax	21,239	9,768
Unrealized loss on fair value adjustment of derivative instruments	(30,658)	(11,294)
Reclassification of net realized loss on derivatives to earnings	20,960	11,656
Taxes on changes in derivative transactions	(1,340)	18
Derivative adjustments, net of tax	(11,038)	380
Amortization of pension and other postretirement plan:
Net prior service cost	248	241
Net loss	370	631
Foreign currency exchange rate changes on pension and other postretirement benefit plan liabilities	(1,697)	(1,502)
Taxes on changes in pension and other postretirement benefit plan liability adjustments, net of foreign currency exchange rate changes	356	240
Pension and other postretirement benefit plan adjustments, net of tax	(723)	(390)
Total comprehensive earnings	$ 51,048	$ 63,131