SEGMENTS (Summary of Segment Revenues, Operating Costs and Balance Sheet Items) (Details) $ in Thousands		3 Months Ended												12 Months Ended
		Aug. 31, 2016 USD ($) warehouse country	May 31, 2016 USD ($)	Feb. 29, 2016 USD ($)	Nov. 30, 2015 USD ($)	Aug. 31, 2015 USD ($)	May 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Nov. 30, 2014 USD ($)	Aug. 31, 2014 USD ($)	May 31, 2014 USD ($)	Feb. 28, 2014 USD ($)	Nov. 30, 2013 USD ($)	Aug. 31, 2016 USD ($) warehouse country	Aug. 31, 2015 USD ($)		Aug. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of stores | warehouse		38												38
Number of countries | country		13												13
Segment Reporting Information
Revenues														$ 2,905,176	$ 2,802,603		$ 2,517,567
Depreciation and amortization														39,794	34,445		28,475
Operating income														136,723	146,366		136,707
Interest income														1,307	1,058		853
Interest expense														5,891	6,440		4,295
Provision for income taxes														42,849	47,566		41,372
Net income		$ 22,272	$ 16,837	$ 25,942	$ 23,672	$ 22,447	$ 21,195	$ 24,835	$ 20,647	$ 21,856	$ 21,320	$ 28,278	$ 21,432	88,723	89,124		92,886
Long-lived assets (other than deferred tax assets)		536,286				484,003				492,956				536,286	484,003		492,956
Goodwill		35,637				35,871				36,108				35,637	35,871		36,108
Investment in unconsolidated affiliates		10,767				10,317				8,863				10,767	10,317		8,863
Total assets		1,096,735				991,224				937,338				1,096,735	991,224		937,338
Capital expenditures, net														79,694	91,181		121,140
Decrease in operating income and net income														10,900
Reduction to taxable income														3,900
United States [Member]
Segment Reporting Information
Revenues														33,885	33,320		31,279
Depreciation and amortization														4,775	2,733		2,238
Operating income														8,576	26,728		22,191
Interest income														25	79		18
Interest expense															5		34
Provision for income taxes														10,047	15,548		12,739
Net income														(1,459)	11,490		9,360
Long-lived assets (other than deferred tax assets)		19,222				15,391				16,584				19,222	15,391		16,584
Total assets		100,744				89,133				91,137				100,744	89,133		91,137
Capital expenditures, net														8,617	1,655	[1]	7,627
Central American Operations [Member]
Segment Reporting Information
Revenues														1,758,853	1,625,567		1,503,446
Depreciation and amortization														18,673	15,115		12,992
Operating income														136,613	130,763		119,101
Interest income														802	811		631
Interest expense														4,823	4,147		2,530
Provision for income taxes														23,227	24,618		21,542
Net income														108,777	102,397		96,204
Long-lived assets (other than deferred tax assets)		271,039				255,576				236,663				271,039	255,576		236,663
Goodwill		31,091				31,211				31,383				31,091	31,211		31,383
Investment in unconsolidated affiliates		10,767				10,317				8,863				10,767	10,317		8,863
Total assets		515,478				491,155				456,715				515,478	491,155		456,715
Capital expenditures, net														29,375	54,735		35,802
Caribbean Operations [Member]
Segment Reporting Information
Revenues														840,648	821,047		785,225
Depreciation and amortization														9,907	9,605		9,062
Operating income														52,044	49,351		45,343
Interest income														381	114		159
Interest expense														547	607		712
Provision for income taxes														8,697	6,787		6,701
Net income														43,708	41,626		38,534
Long-lived assets (other than deferred tax assets)		108,426				107,746				108,409				108,426	107,746		108,409
Goodwill		4,546				4,660				4,725				4,546	4,660		4,725
Total assets		$ 287,088				239,272				223,237				287,088	239,272		223,237
Capital expenditures, net														$ 11,402	10,619		9,534
Colombia [Member]
Segment Reporting Information [Line Items]
Number of stores | warehouse		6												6
Segment Reporting Information
Revenues														$ 271,790	322,669		197,617
Depreciation and amortization														6,439	6,992		4,183
Operating income														(4,984)	(1,488)		4,881
Interest income														99	54		45
Interest expense														521	1,681		1,019
Provision for income taxes														878	613		390
Net income														(6,777)	(7,401)		3,597
Long-lived assets (other than deferred tax assets)		$ 137,599				105,290				131,300				137,599	105,290		131,300
Total assets		$ 193,425				$ 171,664				$ 166,249				193,425	171,664		166,249
Capital expenditures, net														30,300	24,172		68,177
Intersegment [Member]
Segment Reporting Information
Revenues	[2]													(1,092,618)	(1,113,218)		(964,562)
Interest income	[2]													(4,017)	(3,980)		(3,489)
Interest expense	[2]													(4,023)	(3,980)		(3,489)
Intersegment [Member] | United States [Member]
Segment Reporting Information
Revenues														(1,086,677)	(1,107,592)		(959,297)
Interest income														(2,519)	(3,142)		(2,603)
Interest expense														(61)	(126)		(120)
Intersegment [Member] | Central American Operations [Member]
Segment Reporting Information
Interest income														(944)	(282)		(325)
Interest expense														(2,059)	(1,204)		(1,054)
Intersegment [Member] | Caribbean Operations [Member]
Segment Reporting Information
Revenues														(5,941)	(5,626)		(5,265)
Interest income														(554)	(556)		(561)
Interest expense														(1,854)	(1,966)		(2,014)
Intersegment [Member] | Colombia [Member]
Segment Reporting Information
Interest expense														(49)	(684)		(301)
Reconciling Items [Member]
Segment Reporting Information
Operating income	[2]													(55,526)	(58,988)		(54,809)
Net income	[2]													$ (55,526)	$ (58,988)		$ (54,809)

[1] The decrease in operating income and net income for the United States Operations in fiscal year 2016 compared to fiscal year 2015 was primarily a result of the increase in operating expenses related to intercompany transactions with the Company's Colombia subsidiary of approximately $10.9 million. This activity results in reductions to taxable income in the U.S. that lowered the provision for income taxes by approximately $3.9 million.

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