Condensed Consolidated Statements of Comprehensive Earnings (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Comprehensive earnings
Net earnings	$ 43,855us-gaap_NetIncomeLoss	$ 44,798us-gaap_NetIncomeLoss	$ 87,639us-gaap_NetIncomeLoss	$ 68,181us-gaap_NetIncomeLoss
Other comprehensive earnings:
Foreign currency translation adjustments	(22,012)	(243)	(34,945)	4,231
Taxes on changes on foreign currency translation adjustments	411	(139)	1,260	294
Foreign currency translation adjustments, net of tax	(21,601)	(382)	(33,685)	4,525
Reclassification of realized losses on derivatives to earnings	24	24	49	49
Taxes on changes on derivative transactions	(8)	(9)	(18)	(18)
Derivative adjustments, net of tax	16	15	31	31
Minimum retirement benefit liability adjustments (Note 17):
Amortization of prior service cost (benefit)	57	(22)	113	(44)
Amortization of net loss	127	195	257	389
Foreign currency exchange rate changes on minimum retirement benefit liabilities	518	(124)	1,058	(220)
Taxes on changes on minimum retirement benefit liability adjustments, net of foreign currency exchange rate changes	(252)	(18)	(509)	(45)
Minimum retirement benefit liability adjustments, net of tax	450	31	919	80
Total comprehensive earnings	$ 22,720	$ 44,462	$ 54,904	$ 72,817

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