Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Comprehensive earnings
Net earnings	$ 181,452	$ 165,844	$ 145,942
Other comprehensive earnings:
Foreign currency translation adjustments	(34,989)	(16,003)	7,337
Gain on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary	572	0	0
Taxes on changes on foreign currency translation adjustments	1,988	1,080	958
Foreign currency translation adjustments, net of tax	(32,429)	(14,923)	8,295
Reclassification of net realized losses on derivatives to earnings	99	99	171
Realized gain on cash flow hedge	0	0	507
Taxes on changes on derivative transactions	(38)	(37)	(259)
Derivative adjustments, net of tax	61	62	419
Minimum retirement benefit liability adjustments (Note 17):
Net gain (loss) arising during the period	(26,866)	3,746	26,756
Prior service cost arising during the period	0	(3,355)	0
Loss (gain) due to settlement or curtailment arising during the period	0	(7,539)	36
Amortization of prior service cost (benefit)	225	(66)	(90)
Amortization of net loss	513	785	1,770
Foreign currency exchange rate changes on minimum retirement benefit liabilities	867	104	673
Taxes on changes on minimum retirement benefit liability adjustments	9,704	2,538	(11,021)
Minimum retirement benefit liability adjustments, net of tax	(15,557)	(3,787)	18,124
Total comprehensive earnings	$ 133,527	$ 147,196	$ 172,780