SEGMENTS (Summary of the Impact of Reclassifications on Segment Reporting) (Details) - USD ($) $ in Thousands	May 31, 2016	Aug. 31, 2015	May 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 1,049,823	$ 991,224	$ 1,015,443
United States Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	85,933	89,133	86,189
Central American Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	511,530	491,155	501,021
Caribbean Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	286,477	239,272	222,273
Columbia [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 165,883	171,664	205,960
Scenario, Previously Reported [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		991,692	1,016,183
Scenario, Previously Reported [Member] | United States Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		89,167	86,224
Scenario, Previously Reported [Member] | Central American Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		491,548	501,021
Scenario, Previously Reported [Member] | Caribbean Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		239,311	222,928
Scenario, Previously Reported [Member] | Columbia [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		171,666	206,010
Scenario, Reclassified [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		(468)	(740)
Scenario, Reclassified [Member] | United States Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		(34)	(35)
Scenario, Reclassified [Member] | Central American Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		(393)
Scenario, Reclassified [Member] | Caribbean Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		(39)	(655)
Scenario, Reclassified [Member] | Columbia [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ (2)	$ (50)