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Pay vs Performance Disclosure number in Millions | 12 Months Ended
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Jun. 27, 2025 USD ($) | Jun. 28, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jul. 01, 2022 USD ($) | Jul. 02, 2021 USD ($)
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table | The amounts reported below as CAP, which are disclosed in accordance with the PVP rules, were not considered as part of this process.
Fiscal Year |  |  |  |  |  |  |  |  |  | Value of Initial Fixed $100 Investment Based on: |  | Net Income(4) |  | Adjusted EBITDA(5)
| Summary Compensation Table Total for Current PEO(1) |  | CAP to Current PEO(1)(2) |  | Summary Compensation Table Total for Former PEO(1) |  | CAP to Former PEO(1)(2) |  | Average Summary Compensation Table Total for Other NEOs(1) |  | Average CAP to Other NEOs(1)(2) |  | Company Total Shareholder Return(3) |  | SPADE® Defense Index Total Shareholder Return(3) |
2025 |  | $ | 10,229,945 |  | $ | 29,935,050 |  | $ | — |  | $ | — |  | $ | 3,016,828 |  | $ | 2,848,525 |  | $ | 66.46 |  | $ | 254.87 |  | $ | (37.9) |  | $ | 119.4
2024 |  | 22,422,508 |  | 12,414,985 |  | — |  | — |  | 2,663,671 |  | 1,306,384 |  | 33.58 |  | 186.03 |  | (137.6) |  | 9.4
2023 |  | 255,967 |  | 92,270 |  | 836,533 |  | (22,242,077) |  | 813,657 |  | (1,656,080) |  | 43.06 |  | 152.99 |  | (28.3) |  | 132.3
2022 |  | — |  | — |  | 18,859,871 |  | 22,797,417 |  | 4,959,848 |  | 7,195,351 |  | 79.73 |  | 128.13 |  | 11.3 |  |  | 200.5
2021 |  | — |  | — |  | 4,949,119 |  | 1,559,821 |  | 1,709,461 |  | 597,369 |  | 82.20 |  | 136.60 |  | 62.0 |  | 201.9
Company Selected Measure Name | adjusted EBITDA |  |  |  |
Named Executive Officers, Footnote | The PEOs and Other NEOs whose compensation is reported in the table above include the current and former officers disclosed in the table below.
|  |  |  |  |  | Fiscal Year
Covered Officer or Group |  | Name |  | NEO Title as of Current or Most Recent Proxy Statement |  | 2025 |  | 2024 |  | 2023 |  | 2022 |  | 2021
Current PEO |  | William L. Ballhaus |  | Chairman, President, and Chief Executive Officer |  | X |  | X |  | X |  |  |  |
Former PEO |  | Mark Aslett |  | Former President and Chief Executive Officer |  |  |  |  |  | X |  | X |  | X
|  | Current Employees: |  |  |  |  |  |  |  |  |  |  |  |
Other NEOs |  | David E. Farnsworth |  | EVP, Chief Financial Officer |  | X |  | X |  |  |  |  |  |
| Stuart H. Kupinsky |  | EVP, Chief Legal Officer, and Corporate Secretary |  | X |  | X |  |  |  |  |  |
| Steven V. Ratner |  | EVP, Chief Human Resources Officer |  | X |  | X |  |  |  |  |  |
| Former Employees: |  |  |  |  |  |  |  |  |  |  |  |
| Charles R. Wells, IV |  | Former EVP, Chief Operating Officer |  | X |  | X |  | X |  | X |  |
| Christopher C. Cambria |  | Former EVP, General Counsel, and Secretary |  |  |  | X |  |  |  |  |  | X
| Allen Couture |  | Former EVP, Execution Excellence |  |  |  | X |  |  |  |  |  |
| Michele M. McCarthy |  | Former SVP, Chief Accounting Officer, Interim Chief Financial Officer,and Interim Treasurer |  |  |  | X |  | X |  |  |  |
| Christine Harbison |  | Former EVP, Chief Growth Officer |  |  |  |  |  | X |  |  |  |
| Michael D. Ruppert |  | Former EVP, Chief Financial Officer and Treasurer |  |  |  |  |  | X |  | X |  | X
| James M. Stevison |  | Former EVP, President of Mission Systems |  |  |  |  |  | X |  | X |  |
| Thomas Huber |  | Former EVP, Chief Transformation Officer |  |  |  |  |  |  |  | X |  |
| Didier M.C. Thibaud |  | Former EVP, Chief Operating Officer |  |  |  |  |  |  |  |  |  | X
Peer Group Issuers, Footnote | Total shareholder returns ("TSRs") are based on an initial $100 investment in each of Mercury common stock and the SPADE® Defense Index, measured on a cumulative basis from July 2, 2020 through the last trading day of each covered fiscal year. We use the SPADE® Defense Index both as a performance modifier under our PSUs granted in fiscal 2025 and in the stock performance graph required by Item 201(e) of Regulation S-K included in our annual report to shareholders. |  |  |  |
Adjustment To PEO Compensation, Footnote | CAP reflects the total compensation reported in the Summary Compensation Table for the applicable fiscal year, as adjusted in accordance with the table below.
Covered Officer or Group |  | Fiscal Year |  | Summary Compensation Table Total |  | Deduction of Stock Awards Included in Summary Compensation Table Total |  | Year End Fair Value of Outstanding and Unvested Equity Awards Granted in Covered Fiscal Year |  | Year-Over-Year Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Year |  | Fair Value at End of Prior Fiscal Year of Equity Awards Forfeited in Covered Fiscal Year(a) |  | Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Same Fiscal Year |  | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Covered Fiscal Year |  | Compensation Actually Paid
Current PEO |  | 2025 |  | $ | 10,229,945 |  |  | $ | (7,553,696) |  |  | $ | 12,380,380 |  |  | $ | 14,597,592 |  |  | $ | — |  |  | $ | — |  |  | $ | 280,829 |  |  | $ | 29,935,050 |
| 2024 |  | 22,422,508 |  |  | (20,906,346) |  |  | 10,905,058 |  |  | — |  |  | — |  |  | — |  |  | (6,235) |  |  | 12,414,985 |
| 2023 |  | 255,967 |  |  | (190,967) |  |  | 137,530 |  |  | (55,394) |  |  | — |  |  | — |  |  | (54,866) |  |  | 92,270 |
Former PEO |  | 2023 |  | 836,533 |  |  | — |  |  | — |  |  | — |  |  | (21,075,879) |  |  | — |  |  | (2,002,731) |  |  | (22,242,077) |
| 2022 |  | 18,859,871 |  |  | (16,981,781) |  |  | 21,054,950 |  |  | 671,932 |  |  | — |  |  | — |  |  | (807,555) |  |  | 22,797,417 |
|  | 2021 |  | 4,949,119 |  |  | (3,732,297) |  |  | 4,049,633 |  |  | (3,677,514) |  |  | — |  |  | — |  |  | (29,120) |  |  | 1,559,821 |
Other NEOs (group average) |  | 2025 |  | 3,016,828 |  |  | (2,145,561) |  |  | 2,292,775 |  |  | (203,578) |  |  | (246,427) |  |  | — |  |  | 134,488 |  |  | 2,848,525 |
| 2024 |  | 2,663,671 |  |  | (1,776,823) |  |  | 887,740 |  |  | (319,226) |  |  | (170,680) |  |  | 41,529 |  |  | (19,827) |  |  | 1,306,384 |
| 2023 |  | 813,657 |  |  | (361,958) |  |  | 277,383 |  |  | (875,095) |  |  | (1,313,428) |  |  | — |  |  | (196,639) |  |  | (1,656,080) |
| 2022 |  | 4,959,848 |  |  | (2,745,023) |  |  | 4,992,208 |  |  | 54,101 |  |  | — |  |  | — |  |  | (65,783) |  |  | 7,195,351 |
|  | 2021 |  | 1,709,461 |  |  | (1,078,205) |  |  | 665,928 |  |  | (693,131) |  |  | — |  |  | — |  |  | (6,684) |  |  | 597,369 |
(a) Amounts reported in this column for fiscal 2025 represent the fair value of unvested LTI awards forfeited by Mr. Wells in his resignation from the Company on April 4, 2025. |  |  |  |
Non-PEO NEO Average Total Compensation Amount | $ 3,016,828 | $ 2,663,671 | $ 813,657 | $ 4,959,848 | $ 1,709,461
Non-PEO NEO Average Compensation Actually Paid Amount | $ 2,848,525 | 1,306,384 | (1,656,080) | 7,195,351 | 597,369
Adjustment to Non-PEO NEO Compensation Footnote | CAP reflects the total compensation reported in the Summary Compensation Table for the applicable fiscal year, as adjusted in accordance with the table below.
Covered Officer or Group |  | Fiscal Year |  | Summary Compensation Table Total |  | Deduction of Stock Awards Included in Summary Compensation Table Total |  | Year End Fair Value of Outstanding and Unvested Equity Awards Granted in Covered Fiscal Year |  | Year-Over-Year Change in Fair Value of Outstanding and Unvested Equity Awards Granted in Prior Fiscal Year |  | Fair Value at End of Prior Fiscal Year of Equity Awards Forfeited in Covered Fiscal Year(a) |  | Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Same Fiscal Year |  | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Covered Fiscal Year |  | Compensation Actually Paid
Current PEO |  | 2025 |  | $ | 10,229,945 |  |  | $ | (7,553,696) |  |  | $ | 12,380,380 |  |  | $ | 14,597,592 |  |  | $ | — |  |  | $ | — |  |  | $ | 280,829 |  |  | $ | 29,935,050 |
| 2024 |  | 22,422,508 |  |  | (20,906,346) |  |  | 10,905,058 |  |  | — |  |  | — |  |  | — |  |  | (6,235) |  |  | 12,414,985 |
| 2023 |  | 255,967 |  |  | (190,967) |  |  | 137,530 |  |  | (55,394) |  |  | — |  |  | — |  |  | (54,866) |  |  | 92,270 |
Former PEO |  | 2023 |  | 836,533 |  |  | — |  |  | — |  |  | — |  |  | (21,075,879) |  |  | — |  |  | (2,002,731) |  |  | (22,242,077) |
| 2022 |  | 18,859,871 |  |  | (16,981,781) |  |  | 21,054,950 |  |  | 671,932 |  |  | — |  |  | — |  |  | (807,555) |  |  | 22,797,417 |
|  | 2021 |  | 4,949,119 |  |  | (3,732,297) |  |  | 4,049,633 |  |  | (3,677,514) |  |  | — |  |  | — |  |  | (29,120) |  |  | 1,559,821 |
Other NEOs (group average) |  | 2025 |  | 3,016,828 |  |  | (2,145,561) |  |  | 2,292,775 |  |  | (203,578) |  |  | (246,427) |  |  | — |  |  | 134,488 |  |  | 2,848,525 |
| 2024 |  | 2,663,671 |  |  | (1,776,823) |  |  | 887,740 |  |  | (319,226) |  |  | (170,680) |  |  | 41,529 |  |  | (19,827) |  |  | 1,306,384 |
| 2023 |  | 813,657 |  |  | (361,958) |  |  | 277,383 |  |  | (875,095) |  |  | (1,313,428) |  |  | — |  |  | (196,639) |  |  | (1,656,080) |
| 2022 |  | 4,959,848 |  |  | (2,745,023) |  |  | 4,992,208 |  |  | 54,101 |  |  | — |  |  | — |  |  | (65,783) |  |  | 7,195,351 |
|  | 2021 |  | 1,709,461 |  |  | (1,078,205) |  |  | 665,928 |  |  | (693,131) |  |  | — |  |  | — |  |  | (6,684) |  |  | 597,369 |
(a) Amounts reported in this column for fiscal 2025 represent the fair value of unvested LTI awards forfeited by Mr. Wells in his resignation from the Company on April 4, 2025. |  |  |  |
Compensation Actually Paid vs. Total Shareholder Return | The following chart illustrates the relationship between the Combined CAP for our PEOs, the Average CAP for Other NEOs and the total shareholder returns set forth in the Pay Versus Performance Table for our five most recently completed fiscal years. |  |  |  |
Compensation Actually Paid vs. Net Income | The following chart illustrates the relationship between the Combined CAP for our PEOs, the Average CAP for Other NEOs and our net income results as set forth in the Pay Versus Performance Table for our five most recently completed fiscal years. |  |  |  |
Compensation Actually Paid vs. Company Selected Measure | The following chart illustrates the relationship between the Combined CAP for our PEOs, the Average CAP for Other NEOs and our Adjusted EBITDA results as set forth in the Pay Versus Performance Table for our five most recently completed fiscal years. |  |  |  |
Total Shareholder Return Vs Peer Group | The following chart illustrates the relationship between the Combined CAP for our PEOs, the Average CAP for Other NEOs and the total shareholder returns set forth in the Pay Versus Performance Table for our five most recently completed fiscal years. |  |  |  |
Tabular List, Table |
Most Important Financial Performance Measures for Fiscal 2024
Adjusted EBITDA | Revenue | Adjusted Free Cash Flow
Three-Year Adjusted EBITDA Margin | Three-Year Revenue Growth |
Total Shareholder Return Amount | $ 66.46 | 33.58 | 43.06 | 79.73 | 82.20
Peer Group Total Shareholder Return Amount | 254.87 | 186.03 | 152.99 | 128.13 | 136.60
Net Income (Loss) | $ (37,900,000) | $ (137,600,000) | $ (28,300,000) | $ 11,300,000 | $ 62,000,000.0
Company Selected Measure Amount | 119.4 | 9.4 | 132.3 | 200.5 | 201.9
Additional 402(v) Disclosure | Amounts reported in millions. |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Adjusted EBITDA |  |  |  |
Non-GAAP Measure Description | We have designated adjusted EBITDA as our Company-Selected Measure under the PVP Rules, which is reported in this table in millions. Adjusted EBITDA is the principal financial measure used under our AIP to align annual payouts with performance. Adjusted EBITDA is a non-GAAP financial measure that excludes the effects of pre-established categories of items that the Human Capital and Compensation Committee believes are not reflective of operating performance. These categories are identical to the adjustments that we use for the external reporting of our adjusted EBITDA results in our periodic earnings releases. For a further discussion, see "Compensation Discussion and Analysis—Elements of Fiscal 2025 Target Pay—Annual Incentives" and "Appendix B: Reconciliation of GAAP Measures to Non-GAAP Measures." The Committee does not consider the calculation of CAP as part of its executive compensation determinations; accordingly, the Committee does not actually use any financial performance measure specifically to link CAP to Company performance. |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Three-Year Adjusted EBITDA Margin |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Revenue |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Three-Year Revenue Growth |  |  |  |
Measure:: 5 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Adjusted Free Cash Flow |  |  |  |
William L. Ballhaus [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount | $ 10,229,945 | $ 22,422,508 | $ 255,967 |  |
PEO Actually Paid Compensation Amount | $ 29,935,050 | $ 12,414,985 | $ 92,270 |  |
PEO Name | William L. Ballhaus | William L. Ballhaus | William L. Ballhaus |  |
Mark Aslett [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount |  |  | $ 836,533 | $ 18,859,871 | $ 4,949,119
PEO Actually Paid Compensation Amount |  |  | $ (22,242,077) | $ 22,797,417 | $ 1,559,821
PEO Name |  |  | Mark Aslett | Mark Aslett | Mark Aslett
PEO | William L. Ballhaus [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (7,553,696) | $ (20,906,346) | $ (190,967) |  |
PEO | William L. Ballhaus [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 12,380,380 | 10,905,058 | 137,530 |  |
PEO | William L. Ballhaus [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 14,597,592 | 0 | (55,394) |  |
PEO | William L. Ballhaus [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 |  |
PEO | William L. Ballhaus [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 280,829 | (6,235) | (54,866) |  |
PEO | William L. Ballhaus [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 |  |
PEO | Mark Aslett [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 0 | $ (16,981,781) | $ (3,732,297)
PEO | Mark Aslett [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 0 | 21,054,950 | 4,049,633
PEO | Mark Aslett [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 0 | 671,932 | (3,677,514)
PEO | Mark Aslett [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 0 | 0 | 0
PEO | Mark Aslett [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | (2,002,731) | (807,555) | (29,120)
PEO | Mark Aslett [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | (21,075,879) | 0 | 0
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (2,145,561) | (1,776,823) | (361,958) | (2,745,023) | (1,078,205)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 2,292,775 | 887,740 | 277,383 | 4,992,208 | 665,928
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (203,578) | (319,226) | (875,095) | 54,101 | (693,131)
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 41,529 | 0 | 0 | 0
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 134,488 | (19,827) | (196,639) | (65,783) | (6,684)
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (246,427) | $ (170,680) | $ (1,313,428) | $ 0 | $ 0

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