STOCKHOLDERS' EQUITY (Schedule of Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
		May 31, 2017	May 31, 2016	Aug. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ (103,951)	$ (101,512)	$ (101,512)
Other comprehensive income (loss)		(4,336)	(4,905)	(2,419)
Amounts reclassified from accumulated other comprehensive income (loss)		29	(14)	(20)
Ending balance		(108,258)	(106,431)	(103,951)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(102,242)	(100,540)	(100,540)
Other comprehensive income (loss)		(4,700)	(4,383)	(1,702)
Amounts reclassified from accumulated other comprehensive income (loss)
Ending balance		(106,942)	(104,923)	(102,242)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(315)	(113)	(113)
Other comprehensive income (loss)				(182)
Amounts reclassified from accumulated other comprehensive income (loss)		29	(14)	(20)	[1]
Ending balance		(286)	(127)	(315)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(1,394)	(859)	(859)
Other comprehensive income (loss)	[2]	364	(522)	(535)
Amounts reclassified from accumulated other comprehensive income (loss)
Ending balance		$ (1,030)	$ (1,381)	$ (1,394)

[1] Amounts reclassified from accumulated other comprehensive income (loss) related to the minimum pension liability are included in warehouse club operations in the Company's Consolidated Statements of Income.

[2] See Note 7 - Derivative Instruments and Hedging Activities.