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RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: Gains, losses and other items (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Restructuring and Related Activities [Abstract] |  |  |
Restructuring plan charges and adjustments | $ 1,725 | $ 3,430 | $ 7,745
Other | 990 | 663 | 0
Total gains, losses and other items, net | 2,715 | 5,001 | 19,933
Early contract terminations | $ 0 | $ 908 | $ 12,188

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