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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 9 Months Ended
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Feb. 28, 2021
Accounting Policies [Abstract] |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jun. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true
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