| 
           Contingent Liabilities Re-measured (Detail) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Sep. 30, 2013 
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           Mar. 31, 2013 
         | 
        
           Sep. 30, 2012 
         | 
      
|---|---|---|---|
| Business Acquisition, Contingent Consideration [Line Items] | |||
| Contingent liabilities | $ 238 | $ 841 | $ 758 | 
| 
           Contingent Liability 
         | 
        |||
| Business Acquisition, Contingent Consideration [Line Items] | |||
| Contingent liabilities | 238 | 841 | |
| 
           Fair Value, Inputs, Level 3 | Contingent Liability 
         | 
        |||
| Business Acquisition, Contingent Consideration [Line Items] | |||
| Contingent liabilities | $ 238 | $ 841 | 
| X | ||||||||||
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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. No definition available. 
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| X | ||||||||||
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- Details 
          
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