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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2014 | May 31, 2020 | May 31, 2019 | May 31, 2018 | May 31, 2017 | Aug. 31, 2016
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Accrual for taxes other than income taxes, Current |  |  |  |  | $ 3,500,000 | $ 4,000,000
Contractual obligation |  |  |  |  | 5,600,000 | 1,500,000
Land purchase option agreement |  |  |  |  | 1,100,000 |
Deposit that could be forfeited |  |  |  |  | 50,000 |
Land under purchase options, Not recorded |  |  |  |  | 30,500,000 |
Purchase commitment, Remaining minimum amount committed |  |  |  |  | 41,000 |
Provisional assessments, includes taxes, penalties and interest related to withholding taxes | $ 2,600,000 |  |  |  |  |
Additional provisional assessment | $ 5,200,000 |  |  |  |  |
Income taxes receivable |  |  |  |  | 15,984,000 | $ 16,778,000
Unknown Country [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Deferred tax assets, net |  |  |  |  | 2,000,000 |
Income taxes receivable |  |  |  |  | $ 3,900,000 |
Scenario, Forecast [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Purchase commitment, Remaining minimum amount committed |  | $ 186,000 | $ 372,000 | $ 372,000 |  |

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