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Fair Value Measurement (Details) | 9 Months Ended
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Dec. 31, 2012
Fair Value, Level 3 Transfers in, Description | There were no transfers of assets in to or out of Level 3 for the three and nine months ended December 31, 2012 and 2011.

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- Definition Disclosures concerning the reasons for transfers into Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueLevel3TransfersInDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration