Consolidated Statements of Comprehensive Earnings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Comprehensive earnings
Net earnings	$ 165,844	$ 145,942	$ 141,589
Other comprehensive earnings:
Foreign currency translation adjustments	(16,003)	7,337	(7,291)
Taxes on changes on foreign currency translation adjustments	1,080	958	2,635
Foreign currency translation adjustments, net of tax	(14,923)	8,295	(4,656)
Reclassification of realized losses on derivatives to earnings	99	171	174
Realized gain on cash flow hedge	0	507	0
Taxes on changes on derivative transactions	(37)	(259)	(66)
Derivative adjustments, net of tax	62	419	108
Minimum retirement benefit liability adjustments (Note 17):
Net gain (loss) arising during the period	3,746	26,756	(17,960)
Prior service cost arising during the period	(3,355)	0	0
Loss (gain) due to settlement or curtailment arising during the period	(7,539)	36	56
Amortization of prior service benefit	(66)	(90)	(484)
Amortization of net loss	785	1,770	1,280
Foreign currency exchange rate changes on minimum retirement benefit liabilities	104	673	(171)
Taxes on changes on minimum retirement benefit liability adjustments	2,538	(11,021)	6,478
Minimum retirement benefit liability adjustments, net of tax	(3,787)	18,124	(10,801)
Total comprehensive earnings	$ 147,196	$ 172,780	$ 126,240