Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	6 Months Ended
Nov. 30, 2011
Derivative Instruments And Hedging Activities [Abstract]
Losses in accumulated other comprehensive income expected to be reclassified into net earnings	$ 1,266,000
Losses in accumulated other comprehensive income expected to be reclassified into net earnings, net of tax	$ 823,000

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

No definition available.

Name:	us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration