Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Comprehensive earnings
Net earnings	$ 180,378	$ 200,507	$ 180,838
Other comprehensive earnings:
Foreign currency translation adjustments	(12,985)	45	(6,615)
Net gain (loss) on foreign currency transactions designated as hedges of net investments in a foreign subsidiaries	838	(1,942)	792
Taxes on changes in foreign currency translation adjustments	(367)	588	1,462
Foreign currency translation and transactions adjustments, net of tax	(12,514)	(1,309)	(4,361)
Unrealized loss on fair value adjustment of derivative instruments	(23,000)
Reclassification of net realized (gains) losses on derivatives to earnings	1,467	(72)	21
Taxes on changes in derivative transactions	456	28	(8)
Derivative adjustments, net of tax	(21,077)	(44)	13
Minimum retirement benefit liability adjustments:
Net gain (loss) arising during the period	13,805	22,979	(19,718)
Loss (gain) due to settlement or curtailment arising during the period	59		47
Amortization of net prior service cost (benefit)	551	(3,470)	226
Amortization of net loss	985	2,570	1,694
Foreign currency exchange rate changes on pension and other postretirement benefit plan liabilities	367	(43)	2,239
Taxes on changes in minimum retirement benefit liability adjustments	(3,932)	(8,164)	5,613
Pension and other postretirement benefit plan adjustments, net of tax	11,835	13,872	(9,899)
Total comprehensive earnings	$ 158,622	$ 213,026	$ 166,591