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Fair Value Measurements Text Tag (Details)	9 Months Ended
Fair Value Measurements Text Tag (Details)	Dec. 31, 2014
FAIR VALUE MEASUREMENTS [Abstract]
Percent of Total Assets Level 3	0.04%carv_PercentOfTotalAssetsLevel3
Transfers between level 1 and level 2	0carv_Transfersbetweenlevel1andlevel2