INCOME TAXES (Narrative) (Details) - USD ($)	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Tax Contingency [Line Items]
Provision for income taxes, percentage	39.30%	31.70%	32.60%
Favorable net impact resulting from the U.S. Tax Reform Transition Tax	2.60%
Unfavorable net impact resulting from the U.S. Tax Reform Transition Tax	10.20%
Net favorable impact	2.40%
Re-measurement of net deferred tax assets/liabilities	0.20%
Deferred Tax Assets, Net, Foreign	$ 9,900,000	$ 9,400,000
Operating loss carryforwards (NOLs), annual limitation amount	7,500,000
Undistributed foreign earnings	45,200,000	544,600,000
Unrecognized tax benefits	7,005,000	7,694,000	$ 7,754,000	$ 8,159,000
Deferred income taxes that could reduce unrecognized tax benefits	4,500,000
Timing Adjustments	400,000
Unrecognized tax benefitt, net amount if recognized would favorably affect the effective tax rate	6,600,000
Expected change in unrecognized tax benefits reduction of taxes payable	1,400,000
Income taxes receivable	24,509,000	16,895,000
Income tax interest and/or penalties accrued	$ 2,100,000	214,000
Colombia Subsidiary [Member]
Income Tax Contingency [Line Items]
Favorable tax impact	1.60%
Net favorable impact	1.00%
Barbados Subsidiary [Member]
Income Tax Contingency [Line Items]
Favorable tax impact	1.60%
Aeropost, Inc [Member]
Income Tax Contingency [Line Items]
Income tax interest and/or penalties accrued	$ 1,800,000
Federal and State Jurisdicition [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	18,000,000	$ 23,500,000
California State Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	5,500,000
Florida State Jurisdiction [Member] | Aeropost, Inc [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	18,000,000
NOL expected to expire	9,400,000
Unknown Country [Member]
Income Tax Contingency [Line Items]
Deferred tax assets, net	2,100,000
Income taxes receivable	$ 7,100,000