Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentNonvestedOptionsWeightedAverageGrantDateFairValue
Namespace Prefix:	basi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of previously nonvested share options (or share units) vested during the current period.

No definition available.

Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedOptionsVestedInPeriod
Namespace Prefix:	basi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The weighted average fair value as of grant date pertaining to an equity-based stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

No definition available.

Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	basi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

For presentations that combine terminations, the number of nonvested shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

No definition available.

Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsForfeituresAndExpirationsInPeriod
Namespace Prefix:	basi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The combined weighted average grant-date fair value associated with nonvested stock options during the period that have either lapsed or been forfeited.

No definition available.

Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsForfeituresAndExpirationsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	basi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Net number of share nonvested options (or share units) granted during the period.

No definition available.

Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsGrantsInPeriod
Namespace Prefix:	basi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The weighted average grant-date fair value of nonvested options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

No definition available.

Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	basi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	basi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingAbstract
Namespace Prefix:	basi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The number of nonvested shares outstanding under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date.

No definition available.