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Employee Benefit Plans (including Share-based Compensation) (Narratives) (Details) - USD ($) |  |  |  | 12 Months Ended | 31 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 01, 2016 | Aug. 27, 2014 | Dec. 02, 2005 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014 | Nov. 20, 2013 | Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Employee stock options and stock awards available for grant |  |  |  | 5,401,052 | 5,450,000 | 8,762,000 |  | 5,401,052
Shares outstanding for options and awards |  |  |  | 6,385,000 | 10,604,000 |  |  | 6,385,000
Total intrinsic value of options exercised |  |  |  | $ 200,000 | $ 400,000 | $ 4,100,000 |  |
Unrecognized compensation costs for non-vested stock awards |  |  |  | $ 10,100,000 |  |  |  | $ 10,100,000
Weighted-average grant-date fair value of options granted (in dollars per share) |  |  |  | $ 1.59 | $ 1.75 | $ 2.36 |  |
401(k) Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum annual contributions per employee |  |  |  | $ 18,000 |  |  |  |
Additional annual contribution per employee over age of 50 |  |  |  | $ 6,000 |  |  |  |
Employer matching contribution per dollar contributed by employee |  |  |  | 50.00% |  |  |  |
Maximum employer matching contribution of employee total compensation (percent) |  |  |  | 2.50% |  |  |  |
Matching contributions to the Plan |  |  |  | $ 1,200,000 | $ 1,100,000 | $ 800,000 |  |
Employer discretionary contributions |  |  |  | $ 0 | 0 | 0 |  |
Non-Executives |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated forfeiture rate |  |  |  | 13.00% |  |  |  |
Executives |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated forfeiture rate |  |  |  | 19.00% |  |  |  |
RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate fair value, as of the respective vesting dates |  |  |  | $ 8,600,000 | $ 8,900,000 | $ 6,100,000 |  |
Aggregate shares withheld upon vesting |  |  |  | 118,129 | 826,943 | 277,473 |  |
Cash remitted to the appropriate taxing authorities |  |  |  | $ 200,000 | $ 2,800,000 | $ 1,600,000 |  |
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost for unvested stock options |  |  |  | $ 1,700,000 |  |  |  | $ 1,700,000
Recognition period for compensation cost not yet recognized (in years, months, and days) |  |  |  | 1 year 9 months 18 days |  |  |  |
Unvested Stock Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognition period for compensation cost not yet recognized (in years, months, and days) |  |  |  | 1 year 10 months 24 days |  |  |  |
Performance Shares | Granted in FY 2015 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognition period for compensation cost not yet recognized (in years, months, and days) |  |  |  | 1 year 10 months 24 days |  |  |  |
2013 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized shares for issuance |  |  |  |  |  |  | 9,000,000 |
Shares subject to previously expired awards reinstated |  |  |  |  |  |  | 12,709,153 |
Decrease in shares available for future grants for each Full Value Award awarded |  |  |  |  |  |  | 1.50% |
Employee stock options and stock awards available for grant |  |  |  | 5,401,052 | 5,450,000 | 8,762,000 |  | 5,401,052
Shares outstanding for options and awards |  |  |  | 5,845,085 |  |  |  | 5,845,085
Contractual term |  |  |  | 7 years |  |  |  |
Shares transferred from 2005 plan to 2013 plan |  |  |  |  |  |  |  | 6,628,643
Enterasys Networks Inc. 2013 Stock Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Employee stock options and stock awards available for grant |  |  |  |  | 0 |  |  |
Shares outstanding for options and awards |  |  |  | 2,009,138 |  |  |  | 2,009,138
Contractual term |  |  |  |  | 7 years |  |  |
2005 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Decrease in shares available for future grants for each Full Value Award awarded |  |  |  | 1.50% |  |  |  |
Employee stock options and stock awards available for grant |  |  |  | 0 |  |  |  | 0
Shares included in outstanding options and awards |  |  |  | 2,754,804 |  |  |  | 2,754,804
Amended 1996 Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Employee stock options and stock awards available for grant |  |  |  | 0 |  |  |  | 0
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized shares for issuance |  | 12,000,000 |  |  |  |  |  |
Maximum offering period per purchase period (in months) |  |  |  | 6 months |  |  |  |
Maximum of total compensation permitted to acquire shares (percent) |  | 15.00% |  |  |  |  |  |
Percent of fair market value for price per share to employees (percent) |  | 85.00% |  |  |  |  |  |
Maximum shares issuable for each purchase period | 1,500,000 | 1,000,000 |  |  |  |  |  |
2014 Employee Stock Purchase Plan | Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized shares for issuance |  |  |  | 1,999,625 |  |  |  | 1,999,625
2014 Employee Stock Purchase Plan | Minimum | Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Offering periods (in months) |  |  |  | 6 months |  |  |  |
2014 Employee Stock Purchase Plan | Maximum | Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Offering periods (in months) |  |  |  | 24 months |  |  |  |
1999 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Authorized shares for issuance |  |  | 12,000,000 |  |  |  |  |
Maximum of total compensation permitted to acquire shares (percent) |  |  | 15.00% |  |  |  |  |
Percent of fair market value for price per share to employees (percent) |  |  | 85.00% |  |  |  |  |
Additional authorized shares for issuance |  |  | 5,000,000 |  |  |  |  |
Shares purchased under plan |  |  |  | 11,933,618 |  |  |  |
2014 Employee Stock Purchase Plan and 1999 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) |  |  |  | $ 0.92 | $ 0.90 | $ 1.64 |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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