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STOCKHOLDERS' EQUITY: - Directors Stock Award Plan (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 27, 2022 | Jun. 30, 2021 | Sep. 30, 2024 | Sep. 30, 2023
Parent Company (Grupo Mexico) |  |  |  |
Activity in directors' stock award plan |  |  |  |
Treasury stock balance at the end of the period (in shares) |  |  | 64,810,241 | 69,798,524
Directors' Stock Award Plan |  |  |  |
Share based Compensation Plan |  |  |  |
Common shares received on election as director |  |  | 1,600 |
Additional shares issued at each annual general meeting |  |  | 1,600 |
Total SCC shares reserved for the plan |  |  | 600,000 | 600,000
Period of extension of plan | 5 years |  |  |
Numbers of shares shall be granted quarterly and conditioned upon the attendance of each director to each Board meeting |  | 400 |  |
Stock based compensation expense |  |  | $ 1.3 | $ 0.7
Activity in directors' stock award plan |  |  |  |
Total shares granted at the beginning of the period (in shares) |  |  | (428,800) | (416,800)
Granted (in shares) |  |  | (12,400) | (9,600)
Total shares granted at the end of the period (in shares) |  |  | (441,200) | (426,400)
Remaining shares reserved |  |  | 158,800 | 173,600

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