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Employee Benefit Plans (Narratives) (Details) |  |  |  |  |  | 12 Months Ended
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Jul. 27, 2020 shares | Nov. 07, 2019 shares | Nov. 08, 2018 shares | Feb. 01, 2016 shares | Aug. 27, 2014 shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) Quarter $ / shares shares | Jun. 30, 2018 shares | Nov. 20, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares outstanding for options and awards |  |  |  |  |  | 1,645,000 | 2,922,000 |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  |  | $ 3,900,000 | $ 600,000 | $ 800,000 |  |
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 | $ |  |  |  |  |  | $ 1,200,000 |  |  |  |
Recognition period for compensation cost not yet recognized (in years, months, and days) |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |
Options granted |  |  |  |  |  | 0 |  |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  | $ 5.16 |  |  |  |
Aggregate shares withheld upon vesting |  |  |  |  |  | 1,300,000 | 1,300,000 | 1,300,000 |  |
Cash remitted to the appropriate taxing authorities | $ |  |  |  |  |  | $ 9,200,000 | $ 8,000,000.0 | $ 8,400,000 |  |
Granted |  |  |  |  |  | 6,367,000 |  |  |  |
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) |  |  |  |  |  | 5.00% |  |  |  |
Matching contributions to the Plan | $ |  |  |  |  |  | $ 4,200,000 | 3,200,000 | 4,200,000 |  |
Employer discretionary contributions | $ |  |  |  |  |  | $ 0 | 0 | 0 |  |
Performance Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares outstanding for options and awards |  |  |  |  |  | 550,300 |  |  |  |
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 4 months 24 days |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting percentage |  |  |  |  |  | The RSU's granted under the 2013 plan vest over a period of time, generally one-to-three years, and are subject to participant's continued service to the Company. |  |  |  |
Stock options or Awards /units granted, grant date fair value | $ |  |  |  |  |  | $ 32,700,000 |  |  |  |
Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate fair value, as of the respective granted dates | $ |  |  |  |  |  | $ 32,900,000 | $ 45,900,000 | $ 30,000,000.0 |  |
MSU |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  | $ 5.32 |  |  |  |
Calculation of total shareholder return (TSR), description |  |  |  |  |  | Total shareholder return is calculated based on the average closing price for the 30-trading days prior to the beginning and end of the performance periods. Performance is measured based on three periods, with the ability for up to one-third of target shares to vest after years 1 and 2 and the ability for up to the maximum of the full award to vest based on the full 3-year TSR less any shares vested based on 1- and 2- year periods |  |  |  |
Volatility |  |  |  |  |  | 69.00% |  |  |  |
Risk-free interest rate |  |  |  |  |  | 0.18% |  |  |  |
Dividend yield |  |  |  |  |  | 0.00% |  |  |  |
Expected life |  |  |  |  |  | 3 years |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Performance stock unit vesting, consecutive quarters | Quarter |  |  |  |  |  |  |  | 2 |  |
Share-based compensation expense | $ |  |  |  |  |  | $ 2,700,000 |  |  |  |
Performance Shares | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Performance stock unit vesting, earnings per share | $ / shares |  |  |  |  |  | $ 0.09 |  |  |  |
Certain Officers and Executive Vice Presidents | Performance Stock Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options 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 (ratably based upon the time elapsed between August 31, 2018 and the date the hurdle is met) and the remainder will vest quarterly through August 31, 2021. |  |  |  |
Stock options or Awards /units granted, grant date fair value | $ / shares |  |  |  |  |  | $ 2.62 |  |  |  |
Certain Officers and Executive Vice Presidents | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  | 1,600,000 | 600,000 |  |  |
Executive Officer Member | MSU |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted | 500,000 |  |  |  |  |  |  |  |  |
Shares vested, Maximum | 150.00% |  |  |  |  |  |  |  |  |
Executive Officers And Other Vice President Level Employee | Performance Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  | 600,000 | 600,000 |
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 |  |  |  |  |  | 6,800,000 |  |  |  |
Shares outstanding for options and awards |  |  |  |  |  | 10,300,000 |  |  |  |
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 |  |  |  |  |  | 50,000.00 |  |  |  |
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 |  |  |  |  |  | $ 2.47 | $ 1.90 | $ 2.71 |  |
Authorized shares for issuance |  |  |  |  | 12,000,000.0 | 15,100,000 |  |  |  |
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 |  |  |  |  |  | 2,900,000 | 2,700,000 |  |  |
Maximum shares issuable for each purchase period |  |  |  | 1,500,000 | 1,000,000.0 |  |  |  |  |

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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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