Retirement Benefits (Schedule of Allocation of Plan Assets, Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 224,712	$ 208,812	$ 196,253
Defined Benefit Pension Plan [Member] | Global Target Return Equity-Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,103
Defined Benefit Pension Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	458	6,904
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,980	5,009
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,901	11,998
Defined Benefit Pension Plan [Member] | Mutual funds: U.S. corporate bond fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,388	56,813
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,540	16,180
Defined Benefit Pension Plan [Member] | Pooled funds: Japanese fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,987	5,321
Defined Benefit Pension Plan [Member] | Pooled funds: International fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,730	1,777
Defined Benefit Pension Plan [Member] | Mutual funds: U.S. equity large cap fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	54,140	48,506
Defined Benefit Pension Plan [Member] | Mutual funds: International equity large cap growth fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49,513	33,834
Defined Benefit Pension Plan [Member] | Pooled funds: Japanese equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,487	2,536
Defined Benefit Pension Plan [Member] | Pooled funds: International equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,260	2,258
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked U.K. equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,940	7,982
Defined Benefit Pension Plan [Member] | Pooled funds: Index linked international equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,285	9,694
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	0
UNITED STATES | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	160,332	145,886	135,590
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	160,332	145,894
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Global Target Return Equity-Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	291	6,741
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual funds: U.S. corporate bond fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,388	56,813
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Japanese fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: International fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual funds: U.S. equity large cap fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	54,140	48,506
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual funds: International equity large cap growth fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49,513	33,834
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Japanese equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: International equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked international equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Global Target Return Equity-Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual funds: U.S. corporate bond fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: International fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual funds: U.S. equity large cap fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual funds: International equity large cap growth fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: International equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked international equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Global Target Return Equity-Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual funds: U.S. corporate bond fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Japanese fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: International fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual funds: U.S. equity large cap fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual funds: International equity large cap growth fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Japanese equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: International equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
UNITED STATES | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked international equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	64,380	62,926	$ 60,663
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	167	163
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Global Target Return Equity-Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	167	163
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual funds: U.S. corporate bond fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Japanese fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: International fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual funds: U.S. equity large cap fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual funds: International equity large cap growth fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Japanese equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: International equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked U.K. equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Pooled funds: Index linked international equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	64,213	62,755
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Global Target Return Equity-Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,103
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,980	5,009
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,901	11,998
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual funds: U.S. corporate bond fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,540	16,180
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,987	5,321
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: International fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,730	1,777
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual funds: U.S. equity large cap fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual funds: International equity large cap growth fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Japanese equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,487	2,536
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: International equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,260	2,258
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked U.K. equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,940	7,982
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Pooled funds: Index linked international equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,285	9,694
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Global Target Return Equity-Bond Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. long-term government securities fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual funds: U.S. corporate bond fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. corporate bonds fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Japanese fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: International fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual funds: U.S. equity large cap fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual funds: International equity large cap growth fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Japanese equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: International equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked U.K. equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan [Member] | Defined Benefit Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Pooled funds: Index linked international equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	$ 0
UNITED KINGDOM | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	52,810
JAPAN | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 11,570