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Contingent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012
--- | --- | --- | ---
Contingent Liabilities |  |  |
Contingent liability, net of discount | $ 238 | $ 841 | $ 758
Contingent Liability for Acquisition |  |  |
Contingent Liabilities |  |  |
Contingent liability, net of discount | $ 238 | $ 841 |

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- Definition Noncurrent portion of the fair value as of the acquisition date of potential payments under the contingent consideration arrangement, including cash and shares as applicable. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionContingentConsiderationAtFairValueNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration