SEGMENTS (Details) $ in Thousands		3 Months Ended		9 Months Ended
		May 31, 2017 USD ($) country warehouse	May 31, 2016 USD ($)	May 31, 2017 USD ($) country warehouse	May 31, 2016 USD ($)	Aug. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of stores | warehouse		39		39
Number of countries | country		13		13
Segment Reporting Information
Revenue from external customers		$ 730,258	$ 704,262	$ 2,263,126	$ 2,194,124
Depreciation and amortization		11,883	10,271	34,445	29,003
Operating income/(loss)		27,626	27,489	105,407	103,920
Net income/(loss)		18,838	16,837	70,926	66,451
Capital expenditures, net		12,016	20,198	98,419	53,949
Long-lived assets (other than deferred tax assets)		593,616	518,271	593,616	518,271	$ 536,286
Goodwill		35,632	35,652	35,632	35,652	35,637
Total assets		1,143,876	1,049,823	1,143,876	1,049,823	1,096,735
United States Operations [Member]
Segment Reporting Information
Revenue from external customers		6,455	7,108	25,381	21,924
Depreciation and amortization		1,788	1,391	4,837	3,352
Operating income/(loss)		(959)	3,479	6,129	14,141
Net income/(loss)		(2,999)	714	1,961	4,032
Capital expenditures, net		2,336	831	54,465	4,158
Long-lived assets (other than deferred tax assets)		69,141	16,242	69,141	16,242	19,222
Total assets		142,643	85,933	142,643	85,933	100,744
Central American Operations [Member]
Segment Reporting Information
Revenue from external customers		438,871	431,001	1,351,099	1,329,485
Depreciation and amortization		5,142	4,823	15,146	13,634
Operating income/(loss)		32,018	30,898	104,726	103,587
Net income/(loss)		26,475	24,999	84,080	82,634
Capital expenditures, net		6,895	6,760	33,112	22,438
Long-lived assets (other than deferred tax assets)		289,405	269,383	289,405	269,383	271,039
Goodwill		31,113	31,082	31,113	31,082	31,091
Total assets		524,806	511,530	524,806	511,530	515,478
Caribbean Operations [Member]
Segment Reporting Information
Revenue from external customers		201,007	200,041	627,544	641,739
Depreciation and amortization		2,594	2,436	7,583	7,285
Operating income/(loss)		9,993	11,484	36,477	39,732
Net income/(loss)		9,538	9,886	29,279	34,789
Capital expenditures, net		2,015	2,631	8,554	8,381
Long-lived assets (other than deferred tax assets)		107,542	109,145	107,542	109,145	108,426
Goodwill		4,519	4,570	4,519	4,570	4,546
Total assets		$ 295,431	286,477	$ 295,431	286,477	287,088
Colombia Operations [Member]
Segment Reporting Information [Line Items]
Number of stores | warehouse		7		7
Segment Reporting Information
Revenue from external customers		$ 83,925	66,112	$ 259,102	200,976
Depreciation and amortization		2,359	1,621	6,879	4,732
Operating income/(loss)		1,753	(1,642)	4,013	(3,674)
Net income/(loss)		1,003	(2,032)	1,544	(5,138)
Capital expenditures, net		770	9,976	2,288	18,972
Long-lived assets (other than deferred tax assets)		127,528	123,501	127,528	123,501	137,599
Total assets		180,996	165,883	180,996	165,883	$ 193,425
Intersegment [Member]
Segment Reporting Information
Revenue from external customers	[1]	(260,221)	(251,304)	(851,147)	(813,730)
Intersegment [Member] | United States Operations [Member]
Segment Reporting Information
Revenue from external customers		(259,337)	(249,639)	(847,368)	(809,301)
Intersegment [Member] | Caribbean Operations [Member]
Segment Reporting Information
Revenue from external customers		(853)	(1,665)	(3,726)	(4,429)
Intersegment [Member] | Colombia Operations [Member]
Segment Reporting Information
Revenue from external customers		(31)		(53)
Reconciling Items [Member]
Segment Reporting Information
Operating income/(loss)	[1]	(15,179)	(16,730)	(45,938)	(49,866)
Net income/(loss)	[1]	$ (15,179)	$ (16,730)	$ (45,938)	$ (49,866)

[1] The reconciling items reflect the amount eliminated on consolidation of intersegment transactions.