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STOCKHOLDERS' EQUITY (Schedule of Components of Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2021 | May 31, 2020 | May 31, 2021 | May 31, 2020 | Aug. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance, Attributable to PriceSmart |  |  |  | $ 831,719 |  |
Other comprehensive income (loss), Attributable to PriceSmart |  | $ (2,557) | $ (15,411) | (457) | $ (23,590) |
Balance, Attributable to PriceSmart |  | 898,803 |  | 898,803 |  | $ 831,719
Balance |  | 875,251 | 818,867 | 832,732 | 798,279 | 798,279
Balance |  | 899,784 | 819,603 | 899,784 | 819,603 | 832,732
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance, Attributable to PriceSmart |  |  |  | (176,820) | (144,339) | (144,339)
Other comprehensive income (loss), Attributable to PriceSmart |  | (2,590) | (15,446) | (548) | (23,680) |
Balance, Attributable to PriceSmart |  | (177,368) | (168,019) | (177,368) | (168,019) | (176,820)
Balance |  | (174,778) | (152,573) | (176,820) | (144,339) | (144,339)
Balance |  | (177,368) | (168,019) | (177,368) | (168,019) | (176,820)
Foreign Currency Translation Adjustments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), Attributable to PriceSmart |  |  |  | (2,577) | (19,981) | (29,413)
Defined Benefit Pension Plans [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), Attributable to PriceSmart | [1] |  |  | 164 | 53 | (79)
Derivative Instruments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), Attributable to PriceSmart | [2] |  |  | 1,865 | (3,752) | (5,803)
AOCI Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance |  |  |  | 134 | 20 | 20
Balance |  | 225 | 110 | 225 | 110 | 134
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | 91 | 90 | 114
Reclassification From Other Comprehensive Income (Loss) Attributable To Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount reclassified from accumulated other comprehensive income (loss), Attributable to PriceSmart |  |  |  |  |  | 2,814
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance |  |  |  | (176,686) | (144,319) | (144,319)
Balance |  | $ (177,143) | $ (167,909) | (177,143) | (167,909) | (176,686)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | (2,486) | (19,891) | (29,299)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) | [1] |  |  | 164 | 53 | (79)
Accumulated Derivative Instruments Including Portion Attributable To Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss) | [2] |  |  | $ 1,865 | $ (3,752) | (5,803)
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) |  |  |  |  |  | $ 2,814
[1] | Amounts reclassified from accumulated other comprehensive income (loss) related to the minimum pension liability are included in warehouse club and other operations in the Company's consolidated statements of income.
[2] | Refer to Note 8 - Derivative Instruments and Hedging Activities.

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