LAND HELD FOR INVESTMENT (Details Narrative)	6 Months Ended
Apr. 30, 2013 acre
Land Held For Investment Details Narrative
Reclassification of land-unimproved to an asset held for sale (acres)	2,114
Impairment expense recorded during the period, (number of acres)	2.9

The number of acres of the reclassification of land-unimproved to asset held for sale.

No definition available.

Name:	BLRGZ_ReclassificationOfLandunimprovedToAssetHeldForSaleAcres
Namespace Prefix:	BLRGZ_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration