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Benefit Plans | 12 Months Ended
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Oct. 03, 2020
Compensation Related Costs [Abstract] |
Benefit Plans | Benefit Plans Share-based Compensation Plans: The Plexus Corp. 2016 Omnibus Incentive Plan (the "2016 Plan"), which was approved by shareholders, is a stock and cash-based incentive plan, and includes provisions by which the Company may grant executive officers, employees and directors stock options, stock appreciation rights ("SARs"), restricted stock (including restricted stock units ("RSUs"), performance stock awards (including performance stock units ("PSUs"), other stock awards and cash incentive awards. Similar awards were offered under its predecessor, the 2008 Long-Term Incentive Plan (the "2008 Plan"), which is no longer being used for grants; however, outstanding awards granted under the 2008 Plan and its predecessors continue in accordance with their terms. The maximum number of shares of Plexus common stock that may be issued pursuant to the 2016 Plan is 3.2 million shares; in addition, cash incentive awards of up to $4.0 million per employee may be granted annually. The exercise price of each stock option and SAR granted must not be less than the fair market value on the date of grant. The Compensation and Leadership Development Committee (the "Committee") of the Board of Directors may establish a term and vesting period for awards under the 2016 Plan as well as accelerate the vesting of such awards. Generally, stock options vest in two annual installments and have a term of ten years. SARs vest in two annual installments and have a term of seven years. RSUs granted to executive officers, other officers and key employees generally vest on the 3 year anniversary of the grant date (assuming continued employment), which is also the date as of which the underlying shares will be issued. Beginning for fiscal 2017 grants, 50% of PSUs vest based on the relative total shareholder return ("TSR") of the Company's common stock as compared to the companies in the Russell 3000 Index, a market condition, and the remaining 50% vest based upon a three-point annual average of the Company's absolute economic return, a performance condition, each during a performance period of three years performance period. The PSUs granted in fiscal 2016 and prior years vested based solely on the relative TSR of the Company's common stock as compared to companies in the Russell 3000 Index during a performance period of three years. The vesting and payout of awards will range between 0% and 200% of the shares granted based upon performance on the metrics during a performance period. Payout at target, 100% of the shares granted, will occur if the TSR of Plexus stock is at the 50th percentile of companies in the Russell 3000 Index during the performance period and if a 2.5% average economic return is achieved over the performance period of three years. The number of shares that may be issued pursuant to PSUs ranges from zero to 0.5 million. The Committee also grants RSUs to non-employee directors, which generally fully vest on the first anniversary of the grant date, which is also the date the underlying shares are issued (unless further deferred). The Company recognized $24.3 million, $21.3 million and $18.0 million of compensation expense associated with share-based awards in fiscal 2020, 2019 and 2018, respectively. Deferred tax benefits related to equity awards of $8.2 million, $9.2 million and $8.2 million were recognized in fiscal 2020, 2019 and 2018, respectively. A summary of the Company’s stock option and SAR activity follows:
|  | Number of Options/SARs (in thousands) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of September 30, 2017 |  | 972 |  |  | $ | 36.23 |  |  |
Granted |  | — |  |  | — |  |  |
Canceled |  | (4) |  |  | 31.62 |  |  |
Exercised |  | (414) |  |  | 35.01 |  |  |
Outstanding as of September 29, 2018 |  | 554 |  |  | $ | 37.18 |  |  |
Granted |  | — |  |  | — |  |  |
Canceled |  | (2) |  |  | 26.96 |  |  |
Exercised |  | (88) |  |  | 31.55 |  |  |
Outstanding as of September 28, 2019 |  | 464 |  |  | $ | 38.28 |  |  |
Granted |  | — |  |  | — |  |  |
Canceled |  | (16) |  |  | 31.74 |  |  |
Exercised |  | (325) |  |  | 39.78 |  |  |
Outstanding as of October 3, 2020 |  | 123 |  |  | $ | 35.12 |  |  | $ | 4,393 |
|  | Number of Options/SARs (in thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life (years) |  | Aggregate Intrinsic Value (in thousands)
Exercisable as of: |  |  |  |  |  |  |  |
September 29, 2018 |  | 537 |  |  | $ | 36.92 |  |  |  |  |
September 28, 2019 |  | 464 |  |  | $ | 38.28 |  |  |  |  |
October 3, 2020 |  | 123 |  |  | $ | 35.12 |  |  | 3.24 |  | $ | 4,393 |
The following table summarizes outstanding stock option and SAR information as of October 3, 2020 (Options/SARs in thousands):
Range of Exercise Prices |  | Number of Options/SARs Outstanding (in thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Life (years) |  | Number of Options / SARs Exercisable (in thousands) |  | Weighted Average Exercise Price
$25.33 - $27.86 |  | 35 |  |  | $ | 26.24 |  |  | 2.21 |  | 35 |  |  | $ | 26.24 |
$27.87 - $36.79 |  | 33 |  |  | $ | 33.97 |  |  | 2.70 |  | 33 |  |  | $ | 33.97 |
$36.80 - $41.01 |  | 32 |  |  | $ | 39.57 |  |  | 3.63 |  | 32 |  |  | $ | 39.57 |
$41.02 - $45.45 |  | 23 |  |  | $ | 44.33 |  |  | 5.09 |  | 23 |  |  | $ | 44.33 |
$25.33 - $45.45 |  | 123 |  |  | $ | 35.12 |  |  | 3.24 |  | 123 |  |  | $ | 35.12 |
The Company uses the Black-Scholes valuation model to value options and SARs. The Company used its historical stock prices as the basis for its volatility assumptions. The assumed risk-free rates were based on U.S. Treasury rates in effect at the time of grant with a term consistent with the expected option and SAR lives. The expected options and SARs lives represent the period of time that the options and SARs granted are expected to be outstanding and were based on historical experience. There were no options or SARs granted for fiscal 2020, 2019 or 2018. There were no options and SARs vested for fiscal 2020. The fair value of options and SARs vested for fiscal 2019 and 2018 $0.3 million and $1.3 million, respectively. For fiscal 2020, 2019 and 2018, the total intrinsic value of options and SARs exercised was $10.9 million, $2.4 million and $10.9 million, respectively. As of October 3, 2020, all previously granted options and SARS have vested. A summary of the Company’s PSU and RSU activity follows:
|  | Number of Shares (in thousands) |  | Weighted Average Fair Value at Date of Grant |  | Aggregate Intrinsic Value (in thousands)
Units outstanding as of September 30, 2017 |  | 1,068 |  |  | $ | 45.97 |  |  |
Granted |  | 331 |  |  | 61.88 |  |  |
Canceled |  | (42) |  |  | 46.74 |  |  |
Vested |  | (324) |  |  | 45.48 |  |  |
Units outstanding as of September 29, 2018 |  | 1,033 |  |  | $ | 51.19 |  |  |
Granted |  | 375 |  |  | 55.76 |  |  |
Canceled |  | (38) |  |  | 54.03 |  |  |
Vested |  | (408) |  |  | 41.51 |  |  |
Units outstanding as of September 28, 2019 |  | 962 |  |  | $ | 56.97 |  |  |
Granted |  | 377 |  |  | 75.91 |  |  |
Canceled |  | (37) |  |  | 60.95 |  |  |
Vested |  | (451) |  |  | 54.85 |  |  |
Units outstanding as of October 3, 2020 |  | 851 |  |  | $ | 66.33 |  |  | $ | 60,387 |
The Company uses the fair value at the date of grant to value RSUs. As of October 3, 2020, there was $17.0 million of unrecognized compensation expense related to RSUs that is expected to be recognized over a weighted average period of 1.3 years. The Company recognizes share-based compensation expense over the vesting period of PSUs. During the fiscal year ended October 3, 2020, the 0.1 million PSUs granted in fiscal 2017 vested at a 148.4% payout based upon the TSR performance achieved during the performance period. There were 0.1 million PSUs granted during each of fiscal years 2020, 2019 and 2018. As of October 3, 2020, at the target achievement level, there was $8.8 million of unrecognized compensation expense related to PSUs that is expected to be recognized over a weighted average period of 1.8 years. 401(k) Savings Plan: The Company’s 401(k) Retirement Plan covers all eligible U.S. employees. The Company matches employee contributions up to 4.0% of eligible earnings. The Company’s contributions for fiscal 2020, 2019 and 2018 totaled $9.8 million, $9.3 million and $8.1 million, respectively. Deferred Compensation Arrangements: The Company has agreements with certain former executive officers to provide nonqualified deferred compensation. Under these agreements, the Company agrees to pay these former executives, or their designated beneficiaries upon such executives’ deaths, certain amounts annually for the first 15 years subsequent to their retirement. As of October 3, 2020 and September 28, 2019, the related deferred compensation liability associated with these arrangements totaled $0.1 million and $0.2 million, respectively. The Company maintains investments in a trust account to fund required payments under these deferred compensation arrangements. As of October 3, 2020 and September 28, 2019, the total value of the assets held by the trust totaled $10.8 million and $10.4 million, respectively, and was recorded at fair value on a recurring basis. These assets were classified as Level 2 in the fair value hierarchy discussed in Note 1, "Description of Business and Significant Accounting Policies." During each of the fiscal years 2020, 2019 and 2018, the Company made payments to the participants in the amount of $0.1 million. Supplemental Executive Retirement Plan: The Company also maintains a supplemental executive retirement plan (the "SERP") as an additional deferred compensation plan for executive officers. Under the SERP, a covered executive may elect to defer some or all of the participant’s compensation into the plan, and the Company may credit the participant’s account with a discretionary employer contribution. Participants are entitled to payment of deferred amounts and any related earnings upon termination or retirement from Plexus. The SERP allows investment of deferred compensation into individual accounts and, within these accounts, into one or more designated investments. Investment choices do not include Plexus stock. During fiscal 2020, 2019 and 2018, the Company made contributions to the participants’ SERP accounts in the amount of $0.7 million, $0.6 million and $1.0 million, respectively. As of October 3, 2020 and September 28, 2019, the SERP assets held in the trust totaled $12.6 million and $12.1 million, respectively, and the related liability to the participants totaled approximately $12.6 million and $12.1 million, respectively. As of October 3, 2020 and September 28, 2019, the SERP assets held in the trust were recorded at fair value on a recurring basis, and were classified as Level 2 in the fair value hierarchy discussed in Note 1, "Description of Business and Significant Accounting Policies." The trust assets are subject to the claims of the Company’s creditors. The deferred compensation and trust assets and the related liabilities to the participants are included in non-current "Other assets" and non-current "Other liabilities," respectively, in the accompanying Consolidated Balance Sheets.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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