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RETIREMENT PLAN (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
RETIREMENT PLAN [Abstract] |  |
Company's contribution to plan, as a percent of participant's total wages | 1.00%basi_DefiniedContributionPlanEmployerContributionOfParticipantsTotalWagesPercent |
Employer's match percentage | 22.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |
Maximum percentage of participant's contribution eligible for employer matching contribution | 10.00%basi_DefinedContributionPlanEmployerContributionMatchMaximumPercentOfEmployeeContribution |
Maximum annual contribution, percent of participant's annual wages | 30.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |
Contribution expense | $ 1 us-gaap_DefinedContributionPlanCostRecognized | $ 1 us-gaap_DefinedContributionPlanCostRecognized

X
- Definition The maximum percentage of participant's contribution to the plan that the employer will contribute a matching contribution. + References No definition available. + Details
Name: | basi_DefinedContributionPlanEmployerContributionMatchMaximumPercentOfEmployeeContribution
Namespace Prefix: | basi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of participant's total wages that the company contributes to the defined contribution plan. + References No definition available. + Details
Name: | basi_DefiniedContributionPlanEmployerContributionOfParticipantsTotalWagesPercent
Namespace Prefix: | basi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration