Benefit Plans (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended						12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Oct. 31, 2011 U.S. plans [Member]	Sep. 30, 2011 U.S. plans [Member]	Sep. 30, 2010 U.S. plans [Member]	Sep. 30, 2011 Foreign plans [Member]	Sep. 30, 2010 Foreign plans [Member]	Sep. 30, 2009 Foreign plans [Member]	Sep. 30, 2011 Pension Plans [Member]	Sep. 30, 2010 Pension Plans [Member]	Sep. 30, 2009 Pension Plans [Member]	Sep. 30, 2011 Other Postretirement Benefit [Member]	Sep. 30, 2010 Other Postretirement Benefit [Member]	Sep. 30, 2009 Other Postretirement Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net pension and postretirement cost							$ 34,429	$ 25,820	$ 24,971	$ 134,342	$ 104,808	$ 71,742	$ 22,764	$ 22,609	$ 18,173
Pension plan assets at fair value					933,278	1,004,550	419,452	409,298		1,352,730	1,413,848	1,209,135	0	0	0
Pension plan projected benefit obligation							500,969	560,640		1,996,441	1,911,295	1,635,334	269,458	260,124	249,593
Estimated net actuarial loss that will be amortized from accumulated other comprehensive income										(62,700)			(4,645)
Estimated Prior service credit costs that will be amortized from accumulated other comprehensive income										1,772			690
Percent of total plan assets foreign plans							31.00%
Discretionary contribution to its U.S pension plan				100,000
Benefit Plans (Textuals) [Abstract]
Assumed Health care trend rate	7.60%	7.80%
Increase in accumulated post retirement benefit obligation due to one percentage point increase in assumed health care cost trend rates	8,566
Increase in Aggregate service cost and interest cost components retirement benefit obligation due to one percentage point increase in assumed health care cost trend rates	828
Decrease in accumulated post retirement benefit obligation due to one percentage point decrease in assumed health care cost trend rates	7,617
Decrease in Aggregate service cost and interest cost components retirement benefit obligation due to one percentage point decrease in assumed health care cost trend rates Decrease in Aggregate service cost and interest cost components retirement benefit obligation due to one percentage point decrease in assumed health care cost trend rates	723
Post retirement plan Expected Drug subsidy, 2012	2,314
Post retirement plan Expected Drug subsidy, 2013	2,440
Post retirement plan Expected Drug subsidy, 2014	2,549
Post retirement plan Expected Drug subsidy, 2015	2,623
Post retirement plan Expected Drug subsidy, 2016	2,684
Post retirement plan Expected Drug subsidy, 2017-2021	13,800
Percent of total assets domestic plans	69.00%
Company's Target allocation percentage for equity securities	65.00%
Company's Target allocation percentage for fixed income securities	35.00%
Unfunded status of the post employment benefit plans	137,575	112,751
Accumulated and other comprehensive income into post employment benefit cost	13,942
Employees contribution guaranteed by the company to the fixed income fund of the Savings Incentive Plan	240,113
Cost of the Savings Incentive Plan	36,535	34,097	36,438
Ultimate Health care trend rate beginning in 2027	5.00%	4.50%
Employers contribution	The Company matches contributions for eligible employees up to 75% of employees' contributions, up to a maximum of 4.5% of each employee's eligible contribution.
Amount recognized in Accumulated and other comprehensive income before income taxes for net actuarial loss	$ 116,442	$ 76,220