SEGMENTS (Summary of Segment Revenues, Operating Costs and Balance Sheet Items) (Details) $ in Thousands		3 Months Ended
		Nov. 30, 2016 USD ($) warehouse country	Nov. 30, 2015 USD ($)	Aug. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of stores | warehouse		39
Number of countries | country		13
Segment Reporting Information
Revenues		$ 739,572	$ 711,931
Depreciation and amortization		11,117	9,203
Operating income/(loss)		38,379	37,295
Interest income		502	178
Interest expense		1,654	1,373
Provision for income taxes		11,437	12,130
Net income/(loss)		24,869	23,672
Capital expenditures, net		18,004	19,347
Long-lived assets (other than deferred tax assets)		535,621	497,388	$ 536,286
Goodwill		35,603	35,846	35,637
Total assets		1,117,870	1,047,107	1,096,735
United States Operations [Member]
Segment Reporting Information
Revenues		10,755	8,249
Depreciation and amortization		1,574	930
Operating income/(loss)		6,247	5,479
Net income/(loss)		2,308	1,727
Capital expenditures, net		2,337	909
Long-lived assets (other than deferred tax assets)		20,372	15,380	19,222
Total assets		70,283	71,427	100,744
Central American Operations [Member]
Segment Reporting Information
Revenues		438,234	423,560
Depreciation and amortization		4,864	4,241
Operating income/(loss)		34,337	33,709
Net income/(loss)		27,060	26,202
Capital expenditures, net		10,756	11,181
Long-lived assets (other than deferred tax assets)		278,721	266,435	271,039
Goodwill		31,072	31,212	31,091
Total assets		542,238	529,297	515,478
Caribbean Operations [Member]
Segment Reporting Information
Revenues		207,022	211,663
Depreciation and amortization		2,458	2,408
Operating income/(loss)		12,526	13,590
Net income/(loss)		11,173	11,803
Capital expenditures, net		4,438	3,982
Long-lived assets (other than deferred tax assets)		110,939	109,455	108,426
Goodwill		4,531	4,634	4,546
Total assets		$ 321,235	278,104	287,088
Colombia [Member]
Segment Reporting Information [Line Items]
Number of stores | warehouse		7
Segment Reporting Information
Revenues		$ 83,561	68,459
Depreciation and amortization		2,221	1,624
Operating income/(loss)		1,118	(334)
Net income/(loss)		177	(911)
Capital expenditures, net		473	3,275
Long-lived assets (other than deferred tax assets)		125,589	106,118	137,599
Total assets		184,114	168,279	$ 193,425
Intersegment [Member]
Segment Reporting Information
Revenues	[1]	(319,370)	(316,059)
Intersegment [Member] | United States Operations [Member]
Segment Reporting Information
Revenues		(317,662)	(314,621)
Intersegment [Member] | Caribbean Operations [Member]
Segment Reporting Information
Revenues		(1,698)	(1,438)
Intersegment [Member] | Colombia [Member]
Segment Reporting Information
Revenues		(10)
Reconciling Items [Member]
Segment Reporting Information
Operating income/(loss)	[1]	(15,849)	(15,149)
Net income/(loss)	[1]	$ (15,849)	$ (15,149)

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