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Employee Benefit Plans (Narratives) (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended
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Nov. 07, 2019 shares | Nov. 08, 2018 shares | Feb. 01, 2016 shares | Aug. 27, 2014 shares | Mar. 31, 2019 Quarter $ / shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) Quarter $ / shares shares | Jun. 30, 2018 USD ($) Quarter $ / shares shares | Nov. 20, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares outstanding for options and awards |  |  |  |  |  | 2,922,000 | 2,719,000 |  |
Total intrinsic value of options exercised | $ |  |  |  |  |  | $ 600,000 | $ 800,000 | $ 6,300,000 |
Awards granted |  |  |  |  |  | 637,000 |  | 0 |
Weighted-average estimated fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 3.52 | $ 2.62 |  |
Total unrecognized compensation cost for unvested stock options | $ |  |  |  |  |  | $ 1,800,000 |  |  |
Recognition period for compensation cost not yet recognized (in years, months, and days) |  |  |  |  |  | 4 years 1 month 6 days |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  | $ 6.42 |  |  |
Aggregate shares withheld upon vesting |  |  |  |  |  | 1,300,000 | 1,300,000 | 1,000,000.0 |
Cash remitted to the appropriate taxing authorities | $ |  |  |  |  |  | $ 8,000,000.0 | $ 8,400,000 | $ 11,300,000 |
Granted |  |  |  |  |  | 7,151,000 |  |  |
Awards granted, shares |  |  |  |  |  | 7,151,000 |  |  |
401(k) Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum annual contributions per employee | $ |  |  |  |  |  | $ 19,500 |  |  |
Additional annual contribution per employee over age of 50 | $ |  |  |  |  |  | $ 6,500 |  |  |
Employer matching contribution per dollar contributed by employee |  |  |  |  |  | 0.50% |  |  |
Maximum employer matching contribution of employee total compensation (percent) |  |  |  |  |  | 2.50% |  |  |
Matching contributions to the Plan | $ |  |  |  |  |  | $ 3,200,000 | 4,200,000 | 3,300,000 |
Employer discretionary contributions | $ |  |  |  |  |  | 0 | $ 0 | 0 |
Executive Officers and Directors |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  | 900,000 |  |
Awards granted, shares |  |  |  |  |  |  | 900,000 |  |
Stock Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Aggregate fair value, as of the respective granted dates | $ |  |  |  |  |  | $ 45,900,000 | $ 30,000,000.0 | $ 51,200,000 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
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 |  |  |
Share-based compensation arrangement by share-based payment award, award vesting percentage |  |  |  |  |  | The RSUs granted during the year ended June 30, 2020 vest from the original grant date as to one-third (1/3) on the one-year anniversary and one-twelfth (1/12) each quarter thereafter, subject to continued service to the Company. | The RSUs vest from the original grant date as to one-third (1/3) on the one-year anniversary and one-twelfth (1/12) each quarter thereafter, subject to continued service to the Company. |  |
Stock options or Awards /units granted, grant date fair value | $ |  |  |  |  |  | $ 34,400,000 |  |  |
Granted |  |  |  |  |  | 600,000 |  |  |
Awards granted, shares |  |  |  |  |  | 600,000 |  |  |
Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  |  | $ 6.40 |  |
Granted |  |  |  |  |  |  | 600,000 |  |
Performance stock unit vesting, consecutive quarters | Quarter |  |  |  |  | 2 |  | 2 | 2 |
Performance stock unit vesting, earnings per share threshold one | $ / shares |  |  |  |  | $ 0.32 |  | $ 0.20 | $ 0.20 |
Performance stock unit vesting, earnings per share threshold two | $ / shares |  |  |  |  | $ 0.20 |  | $ 0.09 |  |
Awards granted, shares |  |  |  |  |  |  | 600,000 |  |
Performance Shares | Executive Officers and Directors |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  | 200,000 |  |
Awards granted, shares |  |  |  |  |  |  | 200,000 |  |
Performance Shares | Other Vice President Level Employees |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  | 400,000 |  |
Awards granted, shares |  |  |  |  |  |  | 400,000 |  |
Service-based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  |  |  |  |  |  | 50.00% |
Service-based Restricted Stock Units | Executive Officers and Directors |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  | 700,000 |  |
Awards granted, shares |  |  |  |  |  |  | 700,000 |  |
Market-Based Vesting | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  |  |  | $ 10.61 |
Market-Based Vesting | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  |  |  | $ 12.19 |
Certain Officers and Executive Vice Presidents | Performance Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards granted |  |  |  |  |  |  | 851,700 |  |
Stock options/units vesting, stock trigger price | $ / shares |  |  |  |  |  |  | $ 10.00 |  |
Stock options vesting performance period |  |  |  |  |  |  | 3 years |  |
Stock options vesting, Threshold consecutive trading days from August 29, 2018 through August 31, 2021 |  |  |  |  |  |  | 30 days |  |
Share-based compensation arrangement by share-based payment award, award vesting percentage |  |  |  |  |  | If the price hurdle is achieved, the PSOs will vest and will have expense recognized (ratably based upon the time elapsed between August 31, 2018 and the date the hurdle is met) and the remainder will vest and have expense recognized quarterly through August 31, 2021. |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  | $ 2.62 |  |  |
Employees | Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options/units vesting, stock trigger price | $ / shares |  |  |  |  |  |  | $ 10.00 |  |
Performance stock unit vesting, consecutive quarters | Quarter |  |  |  |  |  |  | 2 | 2 |
Employees | Performance Shares | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance stock unit vesting, earnings per share | $ / shares |  |  |  |  |  |  | $ 0.20 | $ 0.32 |
Execs | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  | 1,200,000 |
Awards granted, shares |  |  |  |  |  |  |  | 1,200,000 |
Execs | Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  |  |  |  |  |  | 50.00% |
Execs | Market-Based Vesting |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  | 100,000 |
Awards granted, shares |  |  |  |  |  |  |  | 100,000 |
Named Executive Officers | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  | 600,000 |
Awards granted, shares |  |  |  |  |  |  |  | 600,000 |
Chief Executive Officer | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  |  |  |  |  |  | 40.00% |
Chief Executive Officer | Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  |  |  |  |  |  | 60.00% |
2013 Equity Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Authorized shares for issuance |  |  |  |  |  |  |  |  | 9,000,000.0
Shares subject to previously expired awards reinstated |  |  |  |  |  |  |  |  | 12,700,000
Decrease in shares available for future grants for each Full Value Award awarded |  |  |  |  |  |  |  |  | 150.00%
Additional authorized shares for issuance | 7,000,000.0 |  |  |  |  | 7,000,000.0 |  |  |
Employee stock options and stock awards available for grant |  |  |  |  |  | 13,100,000 |  |  |
Shares outstanding for options and awards |  |  |  |  |  | 9,300,000 |  |  |
Contractual term |  |  |  |  |  | 7 years |  |  |
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 |  |  |  |  |  | 600,000 |  |  |
Contractual term |  |  |  |  |  | 7 years |  |  |
Aerohive 2014 Equity Incentive 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 |  |  |  |  |  | 500,000 |  |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional authorized shares for issuance |  | 7,500,000 |  |  |  |  |  |  |
Weighted-average estimated fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 1.90 | $ 2.71 | $ 3.25 |
Authorized shares for issuance |  |  |  | 12,000,000.0 |  | 12,100,000 |  |  |
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% |  |  |  |  |
Shares issued under stock purchase plan |  |  |  |  |  | 2,700,000 | 2,800,000 |  |
Maximum shares issuable for each purchase period |  |  | 1,500,000 | 1,000,000.0 |  |  |  |  |

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