Derivative Instruments (Narrative) (Details) (Forward Contracts [Member], Cash Flow Hedging [Member], USD $)
May 31, 2009
Forward Contracts [Member] | Cash Flow Hedging [Member]
|Interest rate swap cash flow hedge, notional amount||$ 100.0|
Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.
Reference 1: http://www.xbrl.org/2003/role/presentationRef