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Employee Benefit Plans (Narratives) (Details) |  |  | 12 Months Ended | 55 Months Ended
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Feb. 01, 2016 shares | Aug. 27, 2014 shares | Jun. 30, 2018 USD ($) Quarter $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Nov. 20, 2013 shares | Jun. 30, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares outstanding for options and awards |  |  | 2,193,000 | 3,062,000 |  |  | 2,193,000
Total intrinsic value of options exercised | $ |  |  | $ 6,300,000 | $ 5,700,000 | $ 200,000 |  |
Employee stock options and stock awards available for grant |  |  | 0 | 0 |  |  |
Weighted-average estimated fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 1.59 |  |
Total unrecognized compensation cost for unvested stock options | $ |  |  | $ 200,000 |  |  |  | $ 200,000
Restricted stock units granted |  |  | 4,595,000 |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  | $ 11.15 |  |  |  |
Unrecognized compensation costs for non-vested stock awards | $ |  |  | $ 41,700,000 |  |  |  | $ 41,700,000
401(k) Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum annual contributions per employee | $ |  |  | 18,500 |  |  |  |
Additional annual contribution per employee over age of 50 | $ |  |  | $ 6,000 |  |  |  |
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 | $ |  |  | $ 3,300,000 | $ 1,400,000 | $ 1,200,000 |  |
Employer discretionary contributions | $ |  |  | $ 0 | $ 0 | $ 0 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected volatility rate |  |  | 42.00% |  | 58.00% |  |
Risk free rate |  |  |  | 0.40% | 0.33% |  |
Expected term |  |  | 6 months | 6 months | 1 year 2 months 12 days |  |
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% |  |
Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate fair value, as of the respective vesting dates | $ |  |  | $ 51,200,000 | $ 9,100,000 | $ 8,600,000 |  |
Restricted stock units granted, percentage |  |  | 40.00% |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting percentage |  |  | 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. | 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. |  |  |
Aggregate shares withheld upon vesting |  |  | 1,000,000 | 400,000 | 100,000 |  |
Cash remitted to the appropriate taxing authorities | $ |  |  | $ 11,300,000 | $ 2,000,000 | $ 200,000 |  |
Restricted Stock Units | VPs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted |  |  | 1,200,000 | 1,500,000 |  |  |
Restricted Stock Units | Executive Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted |  |  | 600,000 | 700,000 |  |  |
Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted |  |  | 0 |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  | $ 10.90 |  |  |  |
Expected volatility rate |  |  |  | 56.00% |  |  |
Risk free rate |  |  |  | 0.90% |  |  |
Expected dividend yield |  |  |  | 0.00% |  |  |
Expected term |  |  |  | 3 years |  |  |
Performance Shares | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  |  | $ 3.02 |  |  |
Performance Shares | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  |  | $ 3.09 |  |  |
Performance Shares | VPs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted |  |  |  | 1,400,000 |  |  |
Restricted stock units granted, percentage |  |  | 50.00% | 50.00% |  |  |
Performance Shares | Executive Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted |  |  |  | 900,000 |  |  |
Performance Shares | Chief Executive Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  | 60.00% |  |  |  |
Performance Shares | Employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance stock unit vesting, consecutive quarters | Quarter |  |  | 2 |  |  |  |
Restricted stock units vesting, stock trigger price | $ / shares |  |  | $ 16.00 | $ 5.00 |  |  |
Restricted stock units vesting, Threshold consecutive trading days after January 1, 2017 |  |  |  | 30 days |  |  |
Performance Shares | Employees | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance stock unit vesting, earnings per share | $ / shares |  |  | $ 0.32 |  |  |  |
Service-based Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  | 50.00% | 50.00% |  |  |
Market-Based Vesting | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  | $ 10.61 |  |  |  |
Market-Based Vesting | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  | $ 12.19 |  |  |  |
Market-Based Vesting | VPs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted |  |  | 100,000 |  |  |  |
Stock Price PSU |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  |  | 50.00% |  |  |
Stock Price PSU | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Average adjusted closing stock price | $ / shares |  |  | $ 8.96 |  |  |  |
Stock Price PSU | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares earned, Percentage |  |  | 133.33% |  |  |  |
TSR PSU |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, percentage |  |  |  | 50.00% |  |  |
Expected volatility rate |  |  | 54.00% |  |  |  |
Risk free rate |  |  | 1.50% |  |  |  |
Expected dividend yield |  |  | 0.00% |  |  |  |
Expected term |  |  | 3 years |  |  |  |
Shares earned, Maximum |  |  | 130.00% |  |  |  |
Shares earned, Target |  |  | 100.00% |  |  |  |
TSR PSU | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  | $ 7.01 |  |  |  |
TSR PSU | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock units granted, grant date fair value | $ / shares |  |  | $ 8.76 |  |  |  |
Non-vested 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 6 months 25 days |  |  |  |
2013 Equity Incentive 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 |  |  |  |  |  | 12,700,000 |
Decrease in shares available for future grants for each Full Value Award awarded |  |  |  |  |  | 1.50% |
Additional authorized shares for issuance |  |  | 9,000,000 | 8,300,000 |  |  |
Employee stock options and stock awards available for grant |  |  | 12,100,000 |  |  |  | 12,100,000
Shares outstanding for options and awards |  |  | 9,000,000 |  |  |  | 9,000,000
Contractual term |  |  | 7 years |  |  |  |
Shares transferred from 2005 plan to 2013 plan |  |  |  |  |  |  | 6,600,000
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 |  |  |  | 0
Shares outstanding for options and awards |  |  | 800,000 |  |  |  | 800,000
Contractual term |  |  | 7 years |  |  |  |
2005 Equity Incentive 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 |  |  | 200,000 |  |  |  | 200,000
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 |  |  |  |  |
Weighted-average estimated fair value of options granted (in dollars per share) | $ / shares |  |  | $ 3.25 | $ 1.24 | $ 0.92 |  |
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 |  |  | 6,600,000 |  |  |  | 6,600,000
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 |  |  |  |

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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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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