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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