Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Earnings
Net earnings	$ 259,602	$ 180,378	$ 200,507
Other comprehensive earnings:
Foreign currency translation adjustments	(16,554)	(12,985)	45
Net gain (loss) on foreign currency transactions designated as hedges of net investments in foreign subsidiaries (Note 8)	2,682	838	(1,942)
Taxes on changes on foreign currency translation adjustments	476	(367)	588
Foreign currency translation and transactions adjustments, net of tax	(13,396)	(12,514)	(1,309)
Unrealized gain (loss) on fair value adjustment of derivative instruments (Note 8)	47,759	(23,000)
Reclassification of net realized (gains) losses on derivatives to earnings (Note 8)	(31,446)	1,467	(72)
Taxes on changes on derivative transactions	(326)	456	28
Derivative adjustments, net of tax	15,987	(21,077)	(44)
Minimum retirement benefit liability adjustments (Note 19):
Net gain (loss) arising during the period	(43,817)	13,805	22,979
Prior service cost arising during the period	(601)
Loss due to settlement or curtailment arising during the period		59
Amortization of:
Prior service cost (benefit)	704	551	(3,470)
Net loss	955	985	2,570
Foreign currency exchange rate changes on minimum retirement benefit liabilities	1,318	367	(43)
Taxes on changes on minimum retirement benefit liability adjustments	10,531	(3,932)	(8,164)
Pension and other postretirement benefit plan adjustments, net of tax	(30,910)	11,835	13,872
Total comprehensive earnings	$ 231,283	$ 158,622	$ 213,026