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STOCKHOLDERS' EQUITY (Schedule of Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017 | Aug. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance, Attributable to PriceSmart |  |  |  | $ 708,767 |  |
Balance, Attributable to PriceSmart |  | $ 750,107 |  | 750,107 |  | $ 708,767
Balance |  |  |  | 708,767 | $ 638,071 | 638,071
Other comprehensive income (loss) |  | (2,340) | $ (3,447) | 1,491 | (4,307) |
Balance |  | 750,699 | 689,387 | 750,699 | 689,387 | 708,767
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance, Attributable to PriceSmart |  |  |  | (110,059) | (103,951) | (103,951)
Balance, Attributable to PriceSmart |  | (108,576) | (108,258) | (108,576) | (108,258) | (110,059)
Balance |  |  |  | (110,059) | (103,951) | (103,951)
Other comprehensive income (loss) |  |  |  | 1,483 | (4,307) |
Balance |  | (108,576) | (108,258) | (108,576) | (108,258) | (110,059)
Foreign Currency Translation Adjustments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), Attributable to PriceSmart |  |  |  | (134) | (4,700) | (6,297)
Defined Benefit Pension Plans [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), Attributable to PriceSmart |  |  |  | 101 |  | (166)
Derivative Instruments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), Attributable to PriceSmart | [1] |  |  | 1,516 | 364 | 316
Reclassification From Other Comprehensive Income (Loss) To Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount reclassified from accumulated other comprehensive income (loss), Attributable to PriceSmart | [2] |  |  |  | 29 | 39
AOCI Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance |  |  |  |  |  |
Balance |  | 8 |  | 8 |  |
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | 8 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |
Accumulated Derivative Instruments Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |
Reclassification From Other Comprehensive Income (Loss) Attributable To Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance |  |  |  | (110,059) | (103,951) | (103,951)
Balance |  | $ (108,568) | $ (108,258) | (108,568) | (108,258) | (110,059)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | (126) | (4,700) | (6,297)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | 101 |  | (166)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | $ 1,516 | 364 | 316
Reclassification From Other Comprehensive Income (Loss) Including Portion Attributable To Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  | $ 29 | $ 39
[1] | See Note 7 - Derivative Instruments and Hedging Activities.
[2] | 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.

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