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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Goodwill [Roll Forward] |  |
Beginning balance | $ 1,383 us-gaap_Goodwill |
Impairment loss | (374)us-gaap_GoodwillImpairmentLoss |
Ending balance | 1,009 us-gaap_Goodwill | 1,383 us-gaap_Goodwill
Vetronics [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 374 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = basi_VetronicsMember |
Impairment loss | (374)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = basi_VetronicsMember |
Ending balance |  |
Bioanalytical Services [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 971 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = basi_BioanalyticalServicesMember |
Impairment loss |  |
Ending balance | 971 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = basi_BioanalyticalServicesMember |
Preclinical Services [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 38 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = basi_PreclinicalServicesMember |
Impairment loss |  |
Ending balance | $ 38 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = basi_PreclinicalServicesMember |

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Period Type: | instant

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Details
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Period Type: |

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- Details
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