Condensed Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Condensed Consolidated Statements of Comprehensive Earnings
Net earnings	$ 53,373	$ 49,120
Other comprehensive earnings:
Foreign currency translation adjustments	11,153	(1,734)
Net (loss) gain on foreign currency transactions designated as hedges of net investments in foreign subsidiaries (Note 8)	(1,045)	649
Taxes on changes on foreign currency translation adjustments	(340)	383
Foreign currency translation and transactions adjustments, net of tax	9,768	(702)
Unrealized (loss) gain on fair value adjustment of derivative instruments (Note 8)	(11,294)	18,563
Reclassification of net realized (gain) loss on derivatives to earnings (Note 8)	11,656	(7,826)
Taxes on changes on derivative transactions	18	(208)
Derivative adjustments, net of tax	380	10,529
Amortization of pension and other postretirement plan:
Net prior service cost	241	176
Net loss	631	239
Foreign currency exchange rate changes on pension and other postretirement benefit plan liabilities	(1,502)	303
Taxes on changes in pension and other postretirement benefit plan liability adjustments, net of foreign currency exchange rate changes	240	(209)
Pension and other postretirement benefit plan adjustments, net of tax	(390)	509
Total comprehensive earnings	$ 63,131	$ 59,456