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Segment Reporting - Additional Information (Detail)	Sep. 30, 2011 Entity
Segment Reporting Information [Line Items]
Company reporting units	8

X

- Definition

Number of Reportable Business Segments

+ Details

Name:	beav_NumberOfReportableBusinessSegments
Namespace Prefix:	beav
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration