Employee Benefit Plans (Narratives) (Details)						12 Months Ended
	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