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DELL APPRAISAL RIGHTS MATTER. (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 30, 2016 | Mar. 31, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Mar. 31, 2018
Dell appraisal rights matter [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Nonrecurring charge, net of insurance recovery, related to Dell appraisal rights matter |  |  |  | $ 166.2 |
Insurance proceeds | $ 100.0 | $ 50.0 |  |  |
Price offered per share in Dell merger (in dollars per share) |  |  | $ 13.75 |  |
Dell appraisal rights matter [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Unrecorded gain contingency |  |  |  |  | $ 15.2

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