Benefit Plans - Fair Value Measurements of Foreign Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 83,160		$ 89,291		$ 71,997
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97		258		267
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,041		10,688		9,486
Insurance Contract, Rights and Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80,022		78,345		62,244
Foreign plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	466,450		419,452
Foreign plans [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	285,662		240,268
Foreign plans [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97,628		89,893
Foreign plans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	83,160		89,291
Foreign plans [Member] | Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36,612	[1]	34,905	[1]
Foreign plans [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36,612	[1]	34,905	[1]
Foreign plans [Member] | Government and agency-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,230	[2]	1,065	[2]
Foreign plans [Member] | Government and agency-U.S. [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,230	[2]	1,065	[2]
Foreign plans [Member] | Government and agency-Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,667	[3]	77,949	[3]
Foreign plans [Member] | Government and agency-Foreign [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,317	[3]	36,687	[3]
Foreign plans [Member] | Government and agency-Foreign [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	40,350	[3]	41,262	[3]
Foreign plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	244,418	[4]	215,309	[4]
Foreign plans [Member] | Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	229,672	[4]	201,325	[4]
Foreign plans [Member] | Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,649	[4]	13,726	[4]
Foreign plans [Member] | Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97	[4]	258	[4]
Foreign plans [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,443	[5]	1,191	[5]
Foreign plans [Member] | Cash and cash equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,443	[5]	1,191	[5]
Foreign plans [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,058	[6]	10,688	[6]
Foreign plans [Member] | Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,017	[6]
Foreign plans [Member] | Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,041	[6]	10,688	[6]
Foreign plans [Member] | Insurance Contract, Rights and Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80,022	[7]	78,345	[7]
Foreign plans [Member] | Insurance Contract, Rights and Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 80,022	[7]	$ 78,345	[7]

[1] Values are based upon comparable securities with similar yields and credit ratings.

[2] Values are based on the closing price reported on the major market on which the investments are traded.

[3] Values of instruments classified as Level 1 are based on the closing price reported on the major market on which the investments are traded. Values of instruments classified as Level 2 are based upon quoted market prices from observable pricing sources.

[4] Values of instruments classified as Level 1 are based on the closing price reported on the major market on which the investments are traded. Values of instruments classified as Level 2 are based on the net asset value provided by the fund administrator, which is based on the value of the underlying assets owned by the fund, less its liabilities and then divided by the number of fund units outstanding.

[5] Values are based upon quoted market prices or broker/dealer quotations.

[6] Values represent the estimated fair value based on the fair value of the underlying investment value or cost, adjusted for any accumulated earnings or losses.

[7] Values approximately represent cash surrender value.