Guarantees (Details Textual) In Millions, unless otherwise specified	Sep. 30, 2011 USD ($)	Sep. 30, 2011 GBP (£)
Guarantees (Textual) [Abstract]
Guarantor on Revolving Credit Agreement Between JV and Financial Institution		£ 35
Notional Value of the forward contracts of the JV	155.7
Fair value asset of forward contracts of JV	$ 1.0
Percentage of gains/losses resulting from foreign exchange hedges, indemnified	50.00%	50.00%