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Business combinations (Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Mar. 31, 2013 Enterasys Networks, Inc. | Mar. 31, 2014 Enterasys Networks, Inc. | Mar. 31, 2013 Enterasys Networks, Inc.
Business Acquisition [Line Items] |  |  |  |
Net revenues |  | $ 137,936 | $ 463,600 | $ 465,535
Net loss | $ (16,400) | $ (21,166) | $ (63,410) | $ (35,999)
Net loss per share - basic and diluted (USD per share) |  | $ (0.23) | $ (0.66) | $ (0.38)

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