DEBT - Short-term (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2015
Line of Credit Facility [Line Items]
Total Amount of Facilities	$ 61,869	$ 57,691
Line of Credit, Current facilities used		40,000
Facilities Available	61,433	$ 50,357
Debt, Weighted Average Interest Rate		5.90%
Line of Credit Facility, Increase (Decrease), Net	15,000
Short-term Borrowings
Line of Credit Facility [Line Items]
Line of Credit, Current facilities used	0	$ 6,606
Letters of Credit
Line of Credit Facility [Line Items]
Line of Credit, Current facilities used	436	$ 728
COLOMBIA
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,900