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