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Employee Benefit Plans and Stock-based Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 25, 2020 | Mar. 27, 2020 | Sep. 27, 2019 | Sep. 25, 2020 | Sep. 27, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Realized Tax Benefits, Stock Option Exercised |  |  |  | $ 0 | $ 0 |
Total stock-based compensation | $ 3,930,000 |  | $ 4,096,000 | 13,737,000 | 8,719,000 |
Defined Benefit Plan, Benefit Obligation | 5,700,000 |  |  | 5,700,000 |  | $ 5,300,000
Liability, Defined Benefit Pension Plan, Current | 100,000 |  |  | 100,000 |  |
Liability, Defined Benefit Pension Plan, Noncurrent | $ 5,600,000 |  |  | $ 5,600,000 |  |
Discretionary contributions of plan |  |  |  | 25.00% |  |
Percent of employees' gross pay eligible for matching |  |  |  | 4.00% |  |
Maximum contribution amount per participant |  |  |  | $ 1,000 |  |
Contributions in period |  |  |  | 243,000 | $ 245,000 |
Dividend, Share-based Payment Arrangement, Cash |  |  |  | $ 0 |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  | 1,000,000 |  |
Common Stock, Capital Shares Reserved for Future Issuance | 1,200,000 |  |  | 1,200,000 |  |
Discount Percentage On Purchase Of Stock |  |  |  | 15.00% |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  | 4,000,000 |  |
Common Stock, Capital Shares Reserved for Future Issuance | 6,900,000 |  |  | 6,900,000 |  |
Grants in Period, Number of Shares |  |  |  | 0 |  |
Performance-Based RSU Awards to Settle Incentive Bonus Payments [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Payment Award, Grants in Period |  |  |  | 507,555 | 120,261 |
Total stock-based compensation |  |  |  | $ 3,200,000 |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Payment Award, Grants in Period |  | 67,910 |  |  |  |
Total stock-based compensation | $ 100,000 |  |  | 500,000 |  |
Nonvested Award, Option, Unrecognized Stock-based Compensation, Amount | 200,000 |  |  | 200,000 |  |
PerformanceBased RSU Awards 2019 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Payment Award, Grants in Period |  |  |  |  |  | 85,000
Nonvested Award, Option, Unrecognized Stock-based Compensation, Amount | 100,000 |  |  | $ 100,000 |  |
Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  | 40,000 |  |
Market-based awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Payment Award, Grants in Period |  | 182,830 |  |  |  |
Total stock-based compensation | 200,000 |  | 100,000 | $ 500,000 | $ 200,000 |
Nonvested Award, Option, Unrecognized Stock-based Compensation, Amount | 1,400,000 |  | $ 900,000 | $ 1,400,000 | $ 900,000 |
Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  | 0 |  |
Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |
Share-based Payment Award, Awards, Grants in Period, Fair Value |  | $ 1,100,000 |  |  |  |
Market Based Award 2019 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Nonvested Award, Option, Unrecognized Stock-based Compensation, Amount | 600,000 |  |  | $ 600,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unvested RSUs Award, Total Unrecognized Stock-based Compensation, Amount | $ 16,100,000 |  |  | $ 16,100,000 |  |
Nonvested Award, Cost Not yet Recognized, Weighted-average Period for Recognition |  |  |  | 1 year 9 months |  |
TVN [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payment for Pension and Other Postretirement Benefits |  |  |  | $ 0 |  |
Call Option [Member] | Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of fair market value of Common Stock to purchase shares |  |  |  | 85.00% |  |
Put Option [Member] | Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of fair market value of Common Stock to purchase shares |  |  |  | 15.00% |  |

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