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SELF-INSURANCE (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
SELF-INSURANCE [Abstract] |  |
Self insurance exposure for individual claims | $ 75 basi_SelfInsuranceExposureForIndividualClaims |
Minimum annual aggregate attachment point | 85 basi_AnnualAggregateAttachmentPointMinimum |
Self-insured employee health plan expenses | $ 1,055 basi_SelfInsuredEmployeeHealthPlanExpenses | $ 1,035 basi_SelfInsuredEmployeeHealthPlanExpenses

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- Definition Represents the employer's minimum overall limit of claim liability, which is adjusted based on the size of the group insured, as of the balance sheet date. + References No definition available. + Details
Name: | basi_AnnualAggregateAttachmentPointMinimum
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | basi_SelfInsuranceAbstract
Namespace Prefix: | basi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Self Insurance Exposure For Individual Claims + References No definition available. + Details
Name: | basi_SelfInsuranceExposureForIndividualClaims
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Self Insured Employee Health Plan Expenses + References No definition available. + Details
Name: | basi_SelfInsuredEmployeeHealthPlanExpenses
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration