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Concentration of Credit Risk and Fair Value of Financial Assets and Liabilities (Details)	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Concentration Risk [Line Items]
Concentration Risk, Additional Characteristic	three	four
Concentration Risk, Percentage	91.00%	92.00%

For an entity that discloses a concentration risk as a percentage of some financial balance or benchmark, this item identifies a second characteristic of the concentration. For example, "Europe" is the second characteristic in the phrase: "net assets in Europe are 70% of total net assets".

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