Annual report pursuant to Section 13 and 15(d)

GEOGRAPHIC INFORMATION (Schedule of Revenues Attributable to Product Groups, Services and Royalties) (Details)

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GEOGRAPHIC INFORMATION (Schedule of Revenues Attributable to Product Groups, Services and Royalties) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue   $ 98,287 $ 84,756 $ 85,849 $ 92,615 $ 112,483 $ 100,034 $ 93,778 $ 348,318 $ 398,910 $ 451,469
Service revenue                 147,199 144,037 144,364
Royalty revenue                 57,648 44,492 56,154
Total revenue 127,968 145,869 131,479 147,849 139,925 159,361 147,307 140,846 553,165 587,439 651,987
Disk Systems and Software Solutions [Member]
                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 103,200 124,074 119,044
Tape Automation Systems [Member]
                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 174,438 206,112 245,030
Devices and Media [Member]
                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Product revenue                 $ 70,680 $ 68,724 $ 87,395