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SETTLEMENT OF CONTINGENT LIABILITY (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012
SETTLEMENT OF CONTINGENT LIABILITY [Abstract] |
Contingent liability, annual rent payments | $ 800
Settlement agreement for cancellation of obligations under lease, agreed contribution amount | 250
Settlement consideration, monthly installments | 10
Discounted liability | $ 216

X
- Definition This element represents the annual rent liability contingent upon the sublessor's ability to continue payments. + References No definition available. + Details
Name: | basi_ContingentLiabilityAnnualRentPayments
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The present value of the liability as of the balance sheet date. + References No definition available. + Details
Name: | basi_ContingentLiabilityDiscountedAmountOfLiability
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Element represents the monthly payments made on the settlement consideration. + References No definition available. + Details
Name: | basi_LossContingencySettlementAgreementConsiderationMonthlyPayments
Namespace Prefix: | basi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of consideration the entity has agreed to pay to settle a legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencySettlementAgreementConsideration1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant