Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements of Comprehensive Earnings
Net earnings	$ 240,395	$ 259,602	$ 180,378
Other comprehensive earnings:
Foreign currency translation adjustments	15,668	(16,554)	(12,985)
Net (loss) gain on foreign currency transactions designated as hedges of net investments in foreign subsidiaries	(3,199)	2,682	838
Taxes on changes on foreign currency translation adjustments	75	476	(367)
Foreign currency translation and transactions adjustments, net of tax	12,544	(13,396)	(12,514)
Unrealized (loss) gain on fair value adjustment of derivative instruments	(18,262)	47,759	(23,000)
Reclassification of net realized losses (gains) on derivatives to earnings	2,134	(31,446)	1,467
Taxes on changes on derivative transactions	626	(326)	456
Derivative adjustments, net of tax	(15,502)	15,987	(21,077)
Minimum retirement benefit liability adjustments:
Net gain (loss) arising during the period	20,179	(43,817)	13,805
Prior service cost arising during the period		(601)
Loss due to settlement or curtailment arising during the period			59
Amortization of:
Prior service cost	962	704	551
Net loss	2,523	955	985
Foreign currency exchange rate changes on minimum retirement benefit liabilities	(1,672)	1,318	367
Taxes on changes on minimum retirement benefit liability adjustments	(5,522)	10,531	(3,932)
Pension and other postretirement benefit plan adjustments, net of tax	16,470	(30,910)	11,835
Total comprehensive earnings	$ 253,907	$ 231,283	$ 158,622