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Balance Sheet Accounts (Narratives) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 1 Months Ended
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Mar. 31, 2014 Investment_Securities | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Investment_Securities | Mar. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Oct. 31, 2013 Senior Secured Credit Facilities | Oct. 31, 2013 Senior Secured Credit Facilities Federal Funds Effective Rate | Oct. 31, 2013 Revolving Facility | Mar. 31, 2014 Revolving Facility | Oct. 31, 2013 Term Loan | Mar. 31, 2014 Cost of Product Revenue | Mar. 31, 2013 Cost of Product Revenue | Mar. 31, 2014 Cost of Product Revenue | Mar. 31, 2013 Cost of Product Revenue | Oct. 31, 2013 Enterasys Networks, Inc. | Oct. 31, 2013 Enterasys Networks, Inc. Revolving Facility | Sep. 11, 2012 Santa Clara Headquarters acre | Mar. 31, 2014 Minimum | Mar. 31, 2014 Minimum Net Revenue Customer Concentration Risk | Oct. 31, 2013 Minimum Senior Secured Credit Facilities | Mar. 31, 2014 Maximum | Oct. 31, 2013 Maximum Senior Secured Credit Facilities | Mar. 31, 2014 Cash equivalents Maximum | Mar. 31, 2014 Short-term Investments Minimum | Mar. 31, 2014 Short-term Investments Maximum | Mar. 31, 2014 Marketable Securities Minimum | May 07, 2014 Subsequent Event Revolving Facility
Balance Sheet Accounts [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period for investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months | 3 months | 1 year | 1 year |
Number of securities with unrealized losses | 5 |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investment securities | 20 |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment loss on investments | $ 10,000 |  |  | $ 148,000 | $ 158,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres of land sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |
Net cash proceeds from sale of real estate |  |  |  |  | 0 | 42,659,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,700,000 |  |  |  |  |  |  |  |  |  |
Gain on sale of property | 0 |  | 0 |  | 0 | 11,539,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,500,000 |  |  |  |  |  |  |  |  |  |
Addition due to acquisition of Enterasys (Note 4) |  | 57,922,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense | 11,900,000 |  | 400,000 |  | 18,937,000 | 1,168,000 |  |  |  |  |  |  |  |  | 4,400,000 | 300,000 | 7,300,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Extended warranty period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  | 5 years |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  | 65,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of agreement |  |  |  |  |  |  |  |  |  |  |  | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under Revolving Facility |  |  |  |  | 59,000,000 | 0 |  |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  | 35,000,000 |  |  |  |  |  |  |  |  |  |  |
Repayment of draw |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,000,000
Basis spread |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375% |  | 0.50% |  |  |  |  |
Warranty liability | $ 7,825,000 | $ 7,479,000 | $ 2,896,000 | $ 7,479,000 | $ 7,825,000 | $ 2,896,000 | $ 3,296,000 | $ 2,971,000 | $ 2,871,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standard hardware warranty period |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standard software warranty period |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited lifetime hardware warranty maximum period after end of sale of product |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum investment in one obligor or maker (percent) |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |

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