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RESTRUCTURING (Summary of Restructuring Activity) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]  
Balance $ 978us-gaap_RestructuringReserve
Total Charges 84us-gaap_RestructuringAndRelatedCostIncurredCost
Cash Payments   
Other 16us-gaap_RestructuringReserveAccrualAdjustment
Balance 1,078us-gaap_RestructuringReserve
Lease Related Costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Balance 877us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
Total Charges 84us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
Cash Payments   
Other   
Balance 961us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
Receivable from Sale of Equipment [Member]  
Restructuring Cost and Reserve [Line Items]  
Balance (16)us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= basi_LossOnSaleOfEquipmentMember
Total Charges   
Cash Payments   
Other 16us-gaap_RestructuringReserveAccrualAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= basi_LossOnSaleOfEquipmentMember
Balance   
Other Costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Balance 117us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
Total Charges   
Cash Payments   
Other   
Balance $ 117us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember