DEBT - Long-term (Details) (USD $)	Aug. 31, 2014		Aug. 31, 2013
Debt Instrument [Line Items]
Long-term Debt	$ 91,439,000	[1]	$ 73,020,000	[2]
Less: current portion	11,848,000		12,757,000
Long-term debt, net of current portion	79,591,000		60,263,000
Credit facility current borrowing capacity	61,869,000		35,863,000
Debt Instrument, collateral, non-cash	84,200,000		55,200,000
Debt instrument, collateral, cash	24,600,000		33,800,000
Long term debt with balloon payment [Member]
Debt Instrument [Line Items]
Long-term Debt	11,733,000		23,442,000
Cross Currency Interest Rate Contract [Member]
Debt Instrument [Line Items]
Long-term Debt	22,532,000		30,346,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Long-term Debt	28,200,000		6,525,000
Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	28,974,000		12,707,000
Regularly scheduled loan payments [Member]
Debt Instrument [Line Items]
Long-term Debt	(8,351,000)
Less: current portion	(2,102,000)
Long-term debt, net of current portion			(6,249,000)
Reclassifications of long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	0
Less: current portion	2,567,000
Long-term debt, net of current portion			(2,567,000)
Complies with Financial convenants [Member] | Group of Subsidiaries
Debt Instrument [Line Items]
Long-term Debt	62,500,000		55,900,000
PANAMA | Proceeds from long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	24,000,000
Less: current portion	2,400,000
Long-term debt, net of current portion	21,600,000
PANAMA | Repayments of long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	(3,208,000)
Less: current portion	(500,000)
Long-term debt, net of current portion			(2,708,000)
HONDURAS | Proceeds from long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	13,734,000
Less: current portion	0
Long-term debt, net of current portion	13,734,000
EL SALVADOR | Proceeds from long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	4,208,000
Less: current portion	800,000
Long-term debt, net of current portion	3,408,000
EL SALVADOR | Repayments of long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	(4,066,000)
Less: current portion	(4,066,000)
Long-term debt, net of current portion			0
Colombia Subsidiary [Member] | Repayments of long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	(8,131,000)
Less: current portion	0
Long-term debt, net of current portion			(8,131,000)
Other Comprehensive Income Location [Domain] | Reclassifications of long-term debt [Member]
Debt Instrument [Line Items]
Long-term Debt	233,000	[3]
Less: current portion	(8,000)	[3]
Long-term debt, net of current portion			$ 241,000	[3]

[1] (2) These foreign currency translation adjustments are recorded within other comprehensive income.(3) The carrying amount of cash assets assigned as collateral for this total was $24.6 million, and the carrying amount of non-cash assets assigned as collateral for this total was $84.2 million.

[2] (1) The carrying amount of cash assets assigned as collateral for this total was $33.8 million, and the carrying amount of non-cash assets assigned as collateral for this total was $55.2 million.

[3] (2) These foreign currency translation adjustments are recorded within other comprehensive income.