Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Comprehensive earnings
Net earnings	$ 38,489	$ 38,105	$ 56,749	$ 84,653
Other comprehensive earnings:
Foreign currency translation adjustments	9,584	7,741	14,687	(10,894)
Net gain (loss) on foreign currency transactions designated as hedges of net investments in a foreign subsidiaries	(1,268)	(945)	(2,011)	2,885
Taxes on changes in foreign currency translation adjustments	(450)	(180)	(263)	(486)
Foreign currency translation and transactions adjustments, net of tax	7,866	6,616	12,413	(8,495)
Reclassification of net realized (gains) losses on derivatives to earnings	(18)	(18)	(36)	(36)
Taxes on changes in derivative transactions	6	7	13	14
Derivative adjustments, net of tax	(12)	(11)	(23)	(22)
Minimum retirement benefit liability adjustments:
Loss (gain) due to settlement or curtailment arising during the period	0	0	59	0
Amortization of net prior service cost (benefit)	139	57	276	113
Amortization of net loss	248	640	494	1,281
Foreign currency exchange rate changes on pension and other postretirement benefit plan liabilities	(583)	(312)	(682)	943
Taxes on changes in pension and other postretirement benefit plan liability, net of foreign currency exchange rate changes	60	(152)	(72)	(845)
Pension and other postretirement benefit plan adjustments, net of tax	(136)	233	75	1,492
Total comprehensive earnings	$ 46,207	$ 44,943	$ 69,214	$ 77,628