Sale of Investment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2010
Sale of Investment [Abstract]
Gain on sale of investments	$ 1.2

The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

No definition available.

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