XML 25 R40.htm IDEA: XBRL DOCUMENT v2.4.0.6

Segment Reporting (Narrative) (Detail)	Sep. 30, 2012 Segment
Segment Reporting Information [Line Items]
Number of business units	2

X

- Definition

Number of business units.

+ References

No definition available.

+ Details

Name:	bmc_NumberOfBusinessUnits
Namespace Prefix:	bmc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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