INCOME TAXES (Narrative) (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Income Tax Contingency [Line Items]
Deferred tax liabilities arising from timing differences in certain subsidiaries	$ 1,800,000	$ 1,800,000
Provision for income taxes, percentage	31.70%	32.60%	34.80%
Effective income tax rate change	31.70%
Deferred tax assets, valuation allowance	$ 2,000,000
Deferred Tax Assets, Net, Foreign	9,400,000	$ 8,900,000
Operating loss carryforwards (NOLs), annual limitation amount	3,500,000
Undistributed foreign earnings	544,600,000	472,500,000
Unrecognized tax benefits	7,694,000	7,754,000	$ 8,159,000	$ 8,786,000
Deferred income taxes that could reduce unrecognized tax benefits	7,000,000
Unrecognized tax benefitt, net amount if recognized would favorably affect the effective tax rate	700,000
Expected change in unrecognized tax benefits reduction of taxes payable	26,000
Provisional assessments, includes taxes, penalties and interest related to withholding taxes	2,600,000
Additional provisional assessment	5,300,000
Income taxes receivable	16,895,000	16,778,000
Income tax interest and/or penalties accrued	$ 214,000	370,000
Colombia Subsidiary [Member]
Income Tax Contingency [Line Items]
Favorable tax impact	1.40%
Barbados Subsidiary [Member]
Income Tax Contingency [Line Items]
Favorable tax impact	1.30%
Federal and State Jurisdicition [Member]
Income Tax Contingency [Line Items]
Effective income tax rate change	0.90%
Operating loss carryforwards	$ 3,400,000	$ 5,500,000
Unknown Country [Member]
Income Tax Contingency [Line Items]
Deferred tax assets, net	2,000,000
Income taxes receivable	$ 4,300,000