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Assets and Liabilities that are Required to be Presented on Balance Sheet at Fair Value, Recurring (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent liabilities | $ 841 | $ 841 |
Contingent Liability |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent liabilities | 841 | 841 | 758
Fair Value, Inputs, Level 3 | Contingent Liability |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent liabilities | $ 841 | $ 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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