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SALE OF PREFERRED SHARES AND WARRANTS (Schedule of Change in Fair Value of Warrants) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | May 11, 2011
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Balance at beginning of year |  |  | $ 3,045 us-gaap_WarrantsAndRightsOutstanding
Increase (decrease) in fair value of Class A warrants | 918 us-gaap_FairValueAdjustmentOfWarrants | (601)us-gaap_FairValueAdjustmentOfWarrants |
Balance at end of year |  |  | 3,045 us-gaap_WarrantsAndRightsOutstanding
Class A Warrant [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Balance at beginning of year | 612 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember | 1,213 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember | 1,973 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember
Fair value of Class A warrants exercised | (854)basi_WarrantsOrRightsOutstandingFairValueOfExercises / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember |  |
Increase (decrease) in fair value of Class A warrants | 918 us-gaap_FairValueAdjustmentOfWarrants / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember | (601)us-gaap_FairValueAdjustmentOfWarrants / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember |
Balance at end of year | $ 676 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember | $ 612 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember | $ 1,973 us-gaap_WarrantsAndRightsOutstanding / us-gaap_ClassOfWarrantOrRightAxis = basi_ClassAWarrantMember

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- Definition Warrants Or Rights Outstanding, Fair Value Of Exercises. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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- Details
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