Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Comprehensive earnings
Net earnings	$ 180,838	$ 181,452	$ 165,844
Other comprehensive earnings:
Foreign currency translation adjustments	(6,615)	(34,989)	(16,003)
Net gain on foreign currency transactions designated as hedges of net investments in a foreign subsidiaries	792	572	0
Taxes on changes in foreign currency translation adjustments	1,462	1,988	1,080
Foreign currency translation adjustments, net of tax	(4,361)	(32,429)	(14,923)
Reclassification of net realized losses on derivatives to earnings	21	99	99
Taxes on changes in derivative transactions	(8)	(38)	(37)
Derivative adjustments, net of tax	13	61	62
Minimum retirement benefit liability adjustments (Note 17):
Net gain (loss) arising during the period	(19,718)	(26,866)	3,746
Prior service cost arising during the period	0	0	(3,355)
Loss (gain) due to settlement or curtailment arising during the period	47	0	(7,539)
Amortization of net prior service cost	226	225	(66)
Amortization of net loss	1,694	513	785
Foreign currency exchange rate changes on minimum retirement benefit liabilities	2,239	867	104
Taxes on changes in minimum retirement benefit liability adjustments	5,613	9,704	2,538
Minimum retirment benefit liabiilty adjustments, net of tax	(9,899)	(15,557)	(3,787)
Total comprehensive earnings	$ 166,591	$ 133,527	$ 147,196