Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Comprehensive earnings
Net earnings	$ 38,105	$ 40,824	$ 84,653	$ 66,644
Other comprehensive earnings:
Foreign currency translation adjustments	7,741	10,125	(10,894)	(129)
Net gain (loss) on foreign currency transactions designated as hedges of net investments in a foreign subsidiaries	(945)	(345)	2,885	517
Taxes on changes in foreign currency translation adjustments	(180)	(601)	(486)	(295)
Foreign currency translation and transactions adjustments, net of tax	6,616	9,179	(8,495)	93
Reclassification of net realized (gains) losses on derivatives to earnings	(18)	28	(36)	57
Taxes on changes in derivative transactions	7	(10)	14	(21)
Derivative adjustments, net of tax	(11)	18	(22)	36
Minimum retirement benefit liability adjustments:
Amortization of net prior service cost (benefit)	57	57	113	113
Amortization of net loss	640	425	1,281	852
Foreign currency exchange rate changes on minimum retirement benefit liabilities	(312)	287	943	571
Taxes on changes on minimum retirement benefit liability adjustments, net of foreign currency exchange rate changes	(152)	(290)	(845)	(576)
Pension and other postretirement benefit plan adjustments, net of tax	233	479	1,492	960
Total comprehensive earnings	$ 44,943	$ 50,500	$ 77,628	$ 67,733